Pregnancy week by week

Development: Gestational dating has begun, although fertilisation has usually not happened yet. Pregnancy is dated from the first day of the last period, so roughly the first two weeks are included by convention.

Body changes: A new menstrual cycle begins. Hormones prepare the ovary for ovulation and the uterine lining for possible implantation.

Care: If you are planning pregnancy, discuss regular medicines, long-term conditions and prenatal preventive care with your clinician in advance.

This week’s highlight: The first week of the pregnancy calendar begins before fertilisation, on the first day of the last period.

Trimester: 🌱 First trimester

Development stage: Preparing for gestational dating The pregnancy calendar starts before fertilisation. The body is in the early part of the menstrual cycle: a follicle matures and the uterine lining prepares for possible implantation. This stage explains how medical pregnancy dating works. There is no embryonic development in week one, and ovulation timing can vary from cycle to cycle in the same person.

Approximate size: — Before fertilisation There is no embryo in gestational week 1, so a size comparison is not appropriate.

How you may feel: As pregnancy has usually not yet occurred, sensations are mainly related to the ordinary menstrual cycle. Energy, appetite, sleep and mood may change just as they do in any other cycle.

Common variations: It is normal not to have any pregnancy symptoms: none are expected yet. Ovulation does not have to happen exactly on day 14; everyone’s cycle is different.

Useful information: If you are planning a pregnancy, discuss regular medicines, long-term conditions and prenatal supplements with a clinician in advance. Everyday basics remain simple: sleep, regular meals, water and moderate movement.

Checklist: Review regular medicines with a clinician when planning pregnancy Do not assume ovulation always happens on day 14 Maintain your usual sleep, eating and movement routines

A little fact: Gestational “week 1 of pregnancy” exists before fertilisation: that is how standard pregnancy dating works.

More about your baby: Gestational dating has begun, although fertilisation has usually not happened yet. Pregnancy is dated from the first day of the last period, so roughly the first two weeks are included by convention. At this stage, embryonic development has not yet begun in the usual sense. The calendar therefore describes preparation within the menstrual cycle, rather than changes to a baby. A detail for this week: Gestational “week 1 of pregnancy” exists before fertilisation: that is how standard pregnancy dating works.

Development: There is usually no embryo yet. Ovulation may occur towards the end of this stage in a typical cycle, but its timing varies considerably between cycles.

Body changes: Rising oestrogen helps the follicle mature and prepares the uterine lining. “Day 14” is a guide for a 28-day cycle, not a universal rule.

Care: With irregular cycles, calendar estimates of ovulation and a future due date are less precise.

This week’s highlight: The body prepares for ovulation; its exact day depends on the individual cycle and is not always day 14.

Trimester: 🌱 First trimester

Development stage: Preparing for gestational dating The pregnancy calendar starts before fertilisation. The body is in the early part of the menstrual cycle: a follicle matures and the uterine lining prepares for possible implantation. This stage explains how medical pregnancy dating works. There is no embryonic development in week one, and ovulation timing can vary from cycle to cycle in the same person.

Approximate size: — Before fertilisation In gestational week 2, the body is still preparing for ovulation.

How you may feel: As pregnancy has usually not yet occurred, sensations are mainly related to the ordinary menstrual cycle. Energy, appetite, sleep and mood may change just as they do in any other cycle.

Common variations: It is normal not to have any pregnancy symptoms: none are expected yet. Ovulation does not have to happen exactly on day 14; everyone’s cycle is different.

Useful information: If you are planning a pregnancy, discuss regular medicines, long-term conditions and prenatal supplements with a clinician in advance. Everyday basics remain simple: sleep, regular meals, water and moderate movement.

Checklist: Review regular medicines with a clinician when planning pregnancy Do not assume ovulation always happens on day 14 Maintain your usual sleep, eating and movement routines

A little fact: Ovulation does not have to occur on day 14; this is only an approximate guide for a 28-day cycle.

More about your baby: There is usually no embryo yet. Ovulation may occur towards the end of this stage in a typical cycle, but its timing varies considerably between cycles. At this stage, embryonic development has not yet begun in the usual sense. The calendar therefore describes preparation within the menstrual cycle, rather than changes to a baby. A detail for this week: Ovulation does not have to occur on day 14; this is only an approximate guide for a 28-day cycle.

Development: Fertilisation may occur during this period. The fertilised egg divides, becomes a blastocyst and travels towards the uterine cavity.

Body changes: Most people do not yet feel pregnancy symptoms. hCG starts to rise after implantation, so a test taken too early can be negative.

Care: After assisted reproduction, pregnancy dating and the due date should follow the clinic’s records rather than an ordinary calendar.

This week’s highlight: If fertilisation has occurred, the developing embryo consists of rapidly dividing cells travelling towards the uterus.

Trimester: 🌱 First trimester

Development stage: Fertilisation and implantation After fertilisation, cells divide rapidly as the developing embryo travels towards the uterus. After implantation, hCG starts to rise; this is the hormone detected by most pregnancy tests. This is a very early stage, so even a few days can change test or ultrasound findings noticeably. Testing too early may therefore not give a clear answer.

Approximate size: microscopic a tiny cluster of cells After fertilisation, cells divide rapidly; there is not yet a recognisable baby-shaped body.

How you may feel: Most people either feel nothing yet or notice nonspecific changes such as tiredness, tender breasts, mild lower-abdominal pulling or appetite changes. A period may be missed by week 4, but symptoms vary greatly.

Common variations: Both early symptoms and almost no symptoms can be normal. A very early home test may still be negative, especially after later ovulation.

Useful information: If a test is positive, record the date of your last period and prepare a list of medicines and questions for your first clinical contact. You cannot reliably judge development by how pregnant you feel.

Checklist: Record the first day of your last period Review medicines and supplements with a health professional Arrange your first contact with a doctor or midwife

A little fact: After fertilisation, a single cell divides repeatedly without immediately increasing proportionally in overall size.

More about your baby: Fertilisation may occur during this period. The fertilised egg divides, becomes a blastocyst and travels towards the uterine cavity. Cells divide to form structures that will later become the embryo, placenta and membranes. The changes are enormous in scope, even while everything is still microscopic. A detail for this week: After fertilisation, a single cell divides repeatedly without immediately increasing proportionally in overall size.

Development: The blastocyst implants in the uterine lining. Structures that will become the placenta, amniotic sac and embryo begin to form.

Body changes: You may miss a period or notice tiredness, tender breasts or nausea, but having no symptoms can also be normal.

Care: A home pregnancy test often becomes positive by now. Significant bleeding or severe one-sided pain needs medical assessment.

This week’s highlight: Implantation may have occurred and hCG begins to rise, making a pregnancy test more informative.

Trimester: 🌱 First trimester

Development stage: Fertilisation and implantation After fertilisation, cells divide rapidly as the developing embryo travels towards the uterus. After implantation, hCG starts to rise; this is the hormone detected by most pregnancy tests. This is a very early stage, so even a few days can change test or ultrasound findings noticeably. Testing too early may therefore not give a clear answer.

Approximate size: about 2 mm a poppy seed This is a very rough visual comparison: even a few days can make a noticeable difference early on.

How you may feel: Most people either feel nothing yet or notice nonspecific changes such as tiredness, tender breasts, mild lower-abdominal pulling or appetite changes. A period may be missed by week 4, but symptoms vary greatly.

Common variations: Both early symptoms and almost no symptoms can be normal. A very early home test may still be negative, especially after later ovulation.

Useful information: If a test is positive, record the date of your last period and prepare a list of medicines and questions for your first clinical contact. You cannot reliably judge development by how pregnant you feel.

Checklist: Record the first day of your last period Review medicines and supplements with a health professional Arrange your first contact with a doctor or midwife

A little fact: hCG, the hormone detected by pregnancy tests, starts to rise after implantation.

More about your baby: The blastocyst implants in the uterine lining. Structures that will become the placenta, amniotic sac and embryo begin to form. Cells divide to form structures that will later become the embryo, placenta and membranes. The changes are enormous in scope, even while everything is still microscopic. A detail for this week: hCG, the hormone detected by pregnancy tests, starts to rise after implantation.

Development: An active phase of embryonic development begins. The nervous system, future brain and spinal cord, and heart tissues develop.

Body changes: Hormonal changes may increase tiredness, nausea, urination and sensitivity to smells.

Care: After pregnancy is confirmed, arrange your first clinical contact, particularly if you have long-term conditions or take regular medicines.

This week’s highlight: The nervous system and tissues of future organs begin a period of very active development.

Trimester: 🌱 First trimester

Development stage: Early organ formation This is one of the most intensive stages of development: the nervous system, heart, limbs, facial features and main internal structures begin to form. The embryo is still tiny, but change is rapid. The brain, spinal cord, cardiovascular system and limb buds develop particularly quickly during this stage.

Approximate size: about 2–4 mm a sesame seed Size is still measured in millimetres, while development is extremely rapid.

How you may feel: Nausea, sensitivity to smells, tiredness, sleepiness, bloating and appetite changes often become more noticeable. Breasts may be more sensitive and emotions more changeable as hormones shift quickly.

Common variations: Symptoms can vary from day to day and differ in intensity. Some people have strong nausea, others mainly tiredness, and some feel almost as usual. Having few symptoms alone does not tell you how the pregnancy is developing.

Useful information: Small meals, regular drinks throughout the day and enough rest may be easier to manage than large meals. If nausea prevents you from eating or drinking, contact a clinician rather than relying on a calendar.

Checklist: Keep water and simple snacks nearby Prepare questions for your first appointment Do not change medicines without discussing it with your clinician

A little fact: The neural tube is the early structure from which the brain and spinal cord develop.

More about your baby: An active phase of embryonic development begins. The nervous system, future brain and spinal cord, and heart tissues develop. The body is tiny, but its basic anatomical plan is already forming. The head grows especially quickly, and the nervous and cardiovascular systems change daily. A detail for this week: The neural tube is the early structure from which the brain and spinal cord develop.

Development: Arm and leg buds appear and the areas of the future eyes and ears form. The brain, liver and musculoskeletal system develop.

Body changes: Nausea can occur at any time of day. If vomiting prevents you from keeping food or fluids down, seek medical help.

Care: Cardiac activity may be visible on an early ultrasound, but its absence very early on does not by itself establish a diagnosis. Accurate dating and clinical follow-up matter.

This week’s highlight: The embryo changes daily as facial features, limbs and major body systems begin to form.

Trimester: 🌱 First trimester

Development stage: Early organ formation This is one of the most intensive stages of development: the nervous system, heart, limbs, facial features and main internal structures begin to form. The embryo is still tiny, but change is rapid. The brain, spinal cord, cardiovascular system and limb buds develop particularly quickly during this stage.

Approximate size: about 6 mm a pea The embryo now has noticeable beginnings of its future structures.

How you may feel: Nausea, sensitivity to smells, tiredness, sleepiness, bloating and appetite changes often become more noticeable. Breasts may be more sensitive and emotions more changeable as hormones shift quickly.

Common variations: Symptoms can vary from day to day and differ in intensity. Some people have strong nausea, others mainly tiredness, and some feel almost as usual. Having few symptoms alone does not tell you how the pregnancy is developing.

Useful information: Small meals, regular drinks throughout the day and enough rest may be easier to manage than large meals. If nausea prevents you from eating or drinking, contact a clinician rather than relying on a calendar.

Checklist: Keep water and simple snacks nearby Prepare questions for your first appointment Do not change medicines without discussing it with your clinician

A little fact: At this stage, future arms and legs first look like small buds.

More about your baby: Arm and leg buds appear and the areas of the future eyes and ears form. The brain, liver and musculoskeletal system develop. The body is tiny, but its basic anatomical plan is already forming. The head grows especially quickly, and the nervous and cardiovascular systems change daily. A detail for this week: At this stage, future arms and legs first look like small buds.

Development: The brain develops rapidly and the head remains relatively large. The limbs, face and internal organs continue to form.

Body changes: Circulating blood volume gradually increases. Tiredness, nausea, bloating and frequent urination may continue.

Care: Early pregnancy is a good time to agree a care schedule and tests with your doctor or midwife.

This week’s highlight: The head is still large compared with the body because the brain develops particularly quickly.

Trimester: 🌱 First trimester

Development stage: Early organ formation This is one of the most intensive stages of development: the nervous system, heart, limbs, facial features and main internal structures begin to form. The embryo is still tiny, but change is rapid. The brain, spinal cord, cardiovascular system and limb buds develop particularly quickly during this stage.

Approximate size: about 10 mm a small grape The head is relatively large because the brain is developing especially quickly.

How you may feel: Nausea, sensitivity to smells, tiredness, sleepiness, bloating and appetite changes often become more noticeable. Breasts may be more sensitive and emotions more changeable as hormones shift quickly.

Common variations: Symptoms can vary from day to day and differ in intensity. Some people have strong nausea, others mainly tiredness, and some feel almost as usual. Having few symptoms alone does not tell you how the pregnancy is developing.

Useful information: Small meals, regular drinks throughout the day and enough rest may be easier to manage than large meals. If nausea prevents you from eating or drinking, contact a clinician rather than relying on a calendar.

Checklist: Keep water and simple snacks nearby Prepare questions for your first appointment Do not change medicines without discussing it with your clinician

A little fact: The head is large relative to the body because brain development is very rapid.

More about your baby: The brain develops rapidly and the head remains relatively large. The limbs, face and internal organs continue to form. The body is tiny, but its basic anatomical plan is already forming. The head grows especially quickly, and the nervous and cardiovascular systems change daily. A detail for this week: The head is large relative to the body because brain development is very rapid.

Development: The embryo grows quickly, the arms and legs lengthen and the head gradually straightens. The placenta develops actively and forms its connection with the uterine wall.

Body changes: Tiredness, nausea, tender breasts, bloating and changes in taste or smell are common. Their intensity varies greatly between individuals.

Care: When clinically indicated, first-trimester ultrasound is the most accurate way to confirm or refine gestational age.

This week’s highlight: The placenta increasingly provides the connection between the pregnant person’s body and the pregnancy.

Trimester: 🌱 First trimester

Development stage: Early organ formation This is one of the most intensive stages of development: the nervous system, heart, limbs, facial features and main internal structures begin to form. The embryo is still tiny, but change is rapid. The brain, spinal cord, cardiovascular system and limb buds develop particularly quickly during this stage.

Approximate size: about 16 mm a raspberry The NHS compares the size roughly to a raspberry.

How you may feel: Nausea, sensitivity to smells, tiredness, sleepiness, bloating and appetite changes often become more noticeable. Breasts may be more sensitive and emotions more changeable as hormones shift quickly.

Common variations: Symptoms can vary from day to day and differ in intensity. Some people have strong nausea, others mainly tiredness, and some feel almost as usual. Having few symptoms alone does not tell you how the pregnancy is developing.

Useful information: Small meals, regular drinks throughout the day and enough rest may be easier to manage than large meals. If nausea prevents you from eating or drinking, contact a clinician rather than relying on a calendar.

Checklist: Keep water and simple snacks nearby Prepare questions for your first appointment Do not change medicines without discussing it with your clinician

A little fact: Some English-language week-by-week guides begin using the word fetus rather than embryo around this stage.

More about your baby: The embryo grows quickly, the arms and legs lengthen and the head gradually straightens. The placenta develops actively and forms its connection with the uterine wall. The body is tiny, but its basic anatomical plan is already forming. The head grows especially quickly, and the nervous and cardiovascular systems change daily. A detail for this week: Some English-language week-by-week guides begin using the word fetus rather than embryo around this stage.

Development: The face becomes more recognisable as eyelids, mouth and tongue develop. The main internal organs are in place and continue to mature; bone tissue begins to form.

Body changes: Hormonal changes can affect mood, digestion, breasts and energy levels.

Care: If you have not had your first appointment, do not put it off. Early care helps assess health and plan screening.

This week’s highlight: The main organ structures are in place and continue to grow and become more complex.

Trimester: 🌱 First trimester

Development stage: Approaching the end of the first trimester The basic organ structures are in place and continue to grow and become more complex. Movement increases, although it is usually not felt yet. The first trimester ends after 13 weeks and 6 days. The fetus gradually takes on proportions associated with the next stages of pregnancy.

Approximate size: about 22 mm a strawberry The NHS compares the size roughly to a strawberry.

How you may feel: For some people, nausea and exhausting sleepiness gradually ease; for others they last longer. Your waist may change, breasts may grow, and progesterone can contribute to bloating, constipation or heartburn.

Common variations: Your bump may still be barely visible or already rounded. This depends on anatomy, muscles, previous pregnancies and other factors as well as gestational age. Symptoms do not have to disappear exactly at the trimester boundary.

Useful information: This is a useful time to organise information about tests and screening offered by your healthcare system. Write down questions between appointments so you do not forget them.

Checklist: Confirm your routine examination schedule Write down questions for your next visit Keep up regular moderate activity if you have no restrictions

A little fact: Early structures involved in taste form on the tongue.

More about your baby: The face becomes more recognisable as eyelids, mouth and tongue develop. The main internal organs are in place and continue to mature; bone tissue begins to form. Once the main organ structures are in place, further maturation begins. Movements become more complex, the skeleton gradually hardens and body proportions slowly change. A detail for this week: Early structures involved in taste form on the tongue.

Development: Fingers and joints become more distinct and the skeleton continues to ossify. The heart, brain, kidneys, bowel and other organs continue their complex maturation.

Body changes: The uterus grows, while progesterone can slow digestion and contribute to bloating, constipation or heartburn.

Care: Examination schedules differ between countries. Do not rely only on a calendar: tests and screening follow clinical guidance.

This week’s highlight: Limbs and fingers become more distinct as the skeleton gradually develops bone tissue.

Trimester: 🌱 First trimester

Development stage: Approaching the end of the first trimester The basic organ structures are in place and continue to grow and become more complex. Movement increases, although it is usually not felt yet. The first trimester ends after 13 weeks and 6 days. The fetus gradually takes on proportions associated with the next stages of pregnancy.

Approximate size: about 30 mm a small apricot The NHS compares the size roughly to a small apricot.

How you may feel: For some people, nausea and exhausting sleepiness gradually ease; for others they last longer. Your waist may change, breasts may grow, and progesterone can contribute to bloating, constipation or heartburn.

Common variations: Your bump may still be barely visible or already rounded. This depends on anatomy, muscles, previous pregnancies and other factors as well as gestational age. Symptoms do not have to disappear exactly at the trimester boundary.

Useful information: This is a useful time to organise information about tests and screening offered by your healthcare system. Write down questions between appointments so you do not forget them.

Checklist: Confirm your routine examination schedule Write down questions for your next visit Keep up regular moderate activity if you have no restrictions

A little fact: Tiny buds of the future milk teeth are already forming in the jaws.

More about your baby: Fingers and joints become more distinct and the skeleton continues to ossify. The heart, brain, kidneys, bowel and other organs continue their complex maturation. Once the main organ structures are in place, further maturation begins. Movements become more complex, the skeleton gradually hardens and body proportions slowly change. A detail for this week: Tiny buds of the future milk teeth are already forming in the jaws.

Development: Arms and legs are well formed and fingers are separate. Bones, muscles and nerve connections grow, making movements more complex, though usually not yet felt.

Body changes: Early symptoms may persist or gradually ease. Blood volume and the demands on the cardiovascular system continue to increase.

Care: The first trimester is important for accurate pregnancy dating. Ultrasound through 13 weeks and 6 days most accurately confirms gestational age.

This week’s highlight: There is already plenty of movement, but it is usually too light to feel from outside.

Trimester: 🌱 First trimester

Development stage: Approaching the end of the first trimester The basic organ structures are in place and continue to grow and become more complex. Movement increases, although it is usually not felt yet. The first trimester ends after 13 weeks and 6 days. The fetus gradually takes on proportions associated with the next stages of pregnancy.

Approximate size: about 4 cm a fig A visual comparison to help you picture the scale.

How you may feel: For some people, nausea and exhausting sleepiness gradually ease; for others they last longer. Your waist may change, breasts may grow, and progesterone can contribute to bloating, constipation or heartburn.

Common variations: Your bump may still be barely visible or already rounded. This depends on anatomy, muscles, previous pregnancies and other factors as well as gestational age. Symptoms do not have to disappear exactly at the trimester boundary.

Useful information: This is a useful time to organise information about tests and screening offered by your healthcare system. Write down questions between appointments so you do not forget them.

Checklist: Confirm your routine examination schedule Write down questions for your next visit Keep up regular moderate activity if you have no restrictions

A little fact: Fingers and toes become separate and increasingly noticeable.

More about your baby: Arms and legs are well formed and fingers are separate. Bones, muscles and nerve connections grow, making movements more complex, though usually not yet felt. Once the main organ structures are in place, further maturation begins. Movements become more complex, the skeleton gradually hardens and body proportions slowly change. A detail for this week: Fingers and toes become separate and increasingly noticeable.

Development: Internal organs and muscles are formed and continue to mature. The skeleton gradually develops bone tissue, and movements become more active.

Body changes: Nausea and marked tiredness begin to ease for many people, but not for everyone at the same time.

Care: The WHO care model recommends a first antenatal contact by 12 weeks. Your local appointment schedule may differ.

This week’s highlight: The end of the first trimester is approaching, with the basic organ structures already in place.

Trimester: 🌱 First trimester

Development stage: Approaching the end of the first trimester The basic organ structures are in place and continue to grow and become more complex. Movement increases, although it is usually not felt yet. The first trimester ends after 13 weeks and 6 days. The fetus gradually takes on proportions associated with the next stages of pregnancy.

Approximate size: about 5.4 cm a plum The NHS compares crown-to-rump length roughly to a plum.

How you may feel: For some people, nausea and exhausting sleepiness gradually ease; for others they last longer. Your waist may change, breasts may grow, and progesterone can contribute to bloating, constipation or heartburn.

Common variations: Your bump may still be barely visible or already rounded. This depends on anatomy, muscles, previous pregnancies and other factors as well as gestational age. Symptoms do not have to disappear exactly at the trimester boundary.

Useful information: This is a useful time to organise information about tests and screening offered by your healthcare system. Write down questions between appointments so you do not forget them.

Checklist: Confirm your routine examination schedule Write down questions for your next visit Keep up regular moderate activity if you have no restrictions

A little fact: The skeleton does not yet resemble hard adult bones; it gradually ossifies.

More about your baby: Internal organs and muscles are formed and continue to mature. The skeleton gradually develops bone tissue, and movements become more active. Once the main organ structures are in place, further maturation begins. Movements become more complex, the skeleton gradually hardens and body proportions slowly change. A detail for this week: The skeleton does not yet resemble hard adult bones; it gradually ossifies.

Development: The fetus moves actively with increasing coordination. External genital structures differentiate and the sucking reflex continues to develop.

Body changes: The uterus rises above the pelvis, so the bump may become more noticeable. Ligament stretching and changes in gums, skin or digestion may occur.

Care: This is the end of the first trimester by gestational definition, through 13 weeks and 6 days inclusive.

This week’s highlight: The first trimester is ending; rapid growth becomes particularly noticeable next.

Trimester: 🌱 First trimester

Development stage: Approaching the end of the first trimester The basic organ structures are in place and continue to grow and become more complex. Movement increases, although it is usually not felt yet. The first trimester ends after 13 weeks and 6 days. The fetus gradually takes on proportions associated with the next stages of pregnancy.

Approximate size: about 7–8 cm a peach This comparison is approximate; actual ultrasound measurements may differ.

How you may feel: For some people, nausea and exhausting sleepiness gradually ease; for others they last longer. Your waist may change, breasts may grow, and progesterone can contribute to bloating, constipation or heartburn.

Common variations: Your bump may still be barely visible or already rounded. This depends on anatomy, muscles, previous pregnancies and other factors as well as gestational age. Symptoms do not have to disappear exactly at the trimester boundary.

Useful information: This is a useful time to organise information about tests and screening offered by your healthcare system. Write down questions between appointments so you do not forget them.

Checklist: Confirm your routine examination schedule Write down questions for your next visit Keep up regular moderate activity if you have no restrictions

A little fact: There is already plenty of movement, although it is usually not yet felt from outside.

More about your baby: The fetus moves actively with increasing coordination. External genital structures differentiate and the sucking reflex continues to develop. Once the main organ structures are in place, further maturation begins. Movements become more complex, the skeleton gradually hardens and body proportions slowly change. A detail for this week: There is already plenty of movement, although it is usually not yet felt from outside.

Development: A period of rapid growth begins. The face becomes more proportionate, movements increase, and swallowing and sucking mechanisms are active.

Body changes: For many people, the start of the second trimester brings less nausea and more energy, but this is not universal.

Care: The second trimester begins at 14 weeks and 0 days. Continue planned clinical contacts according to your individual schedule.

This week’s highlight: The second trimester begins, with active growth and maturation of structures already formed.

Trimester: 🌿 Second trimester

Development stage: Beginning of the second trimester With the main organ structures in place, growth and maturation of the nervous system, bones, muscles and sensory structures become more prominent. Some people find this stage easier than the first trimester. At the same time, the bump is growing noticeably and the centre of gravity gradually changes.

Approximate size: about 8.5 cm a kiwi fruit The NHS compares the size roughly to a kiwi fruit.

How you may feel: Many people regain energy and have less nausea in the second trimester, but there is no universal pattern. As the bump grows and your centre of gravity changes, you may notice pulling at the sides of the abdomen, heartburn or a blocked nose.

Common variations: It can be normal not to feel movement yet, especially in a first pregnancy. First movements are often noticed between 16 and 24 weeks, so comparisons with someone else’s timeline are not helpful.

Useful information: Comfortable walks and pelvic-floor exercises often fit well at this stage if your clinician has not advised restrictions. Comfortable clothing and back support may matter more than before.

Checklist: Confirm which routine appointments fall in this period Pay attention to back comfort and posture Start noticing first movements when they actually occur

A little fact: The kidneys already contribute to the circulation of amniotic fluid.

More about your baby: A period of rapid growth begins. The face becomes more proportionate, movements increase, and swallowing and sucking mechanisms are active. Growth in length is especially noticeable now. Bones, muscles and nerve connections work together more effectively, and movements increase. A detail for this week: The kidneys already contribute to the circulation of amniotic fluid.

Development: The skeleton continues to strengthen and limbs become more proportionate. Hearing structures and neuromuscular coordination develop.

Body changes: You may notice a blocked nose, gum changes, dizziness or pulling low in the abdomen as the uterus grows.

Care: Discuss any medicines, including non-prescription and herbal products, with a health professional during pregnancy.

This week’s highlight: Bones continue to harden and the nervous system coordinates movement increasingly well.

Trimester: 🌿 Second trimester

Development stage: Beginning of the second trimester With the main organ structures in place, growth and maturation of the nervous system, bones, muscles and sensory structures become more prominent. Some people find this stage easier than the first trimester. At the same time, the bump is growing noticeably and the centre of gravity gradually changes.

Approximate size: about 10 cm an apple A rough everyday comparison, not a medical growth standard.

How you may feel: Many people regain energy and have less nausea in the second trimester, but there is no universal pattern. As the bump grows and your centre of gravity changes, you may notice pulling at the sides of the abdomen, heartburn or a blocked nose.

Common variations: It can be normal not to feel movement yet, especially in a first pregnancy. First movements are often noticed between 16 and 24 weeks, so comparisons with someone else’s timeline are not helpful.

Useful information: Comfortable walks and pelvic-floor exercises often fit well at this stage if your clinician has not advised restrictions. Comfortable clothing and back support may matter more than before.

Checklist: Confirm which routine appointments fall in this period Pay attention to back comfort and posture Start noticing first movements when they actually occur

A little fact: Facial muscles and nerve connections become more complex, although expressions do not yet have conscious meaning.

More about your baby: The skeleton continues to strengthen and limbs become more proportionate. Hearing structures and neuromuscular coordination develop. Growth in length is especially noticeable now. Bones, muscles and nerve connections work together more effectively, and movements increase. A detail for this week: Facial muscles and nerve connections become more complex, although expressions do not yet have conscious meaning.

Development: The fetus actively moves arms and legs as facial muscles and coordination develop. Some people begin to feel movement, but the usual timing spans a wider range.

Body changes: The bump becomes more noticeable. Round-ligament pain, heartburn, constipation or leg cramps may occur.

Care: First movements are usually felt between 16 and 24 weeks, often later in a first pregnancy.

This week’s highlight: Some people first notice very light movements around this stage, although this often happens later in a first pregnancy.

Trimester: 🌿 Second trimester

Development stage: Beginning of the second trimester With the main organ structures in place, growth and maturation of the nervous system, bones, muscles and sensory structures become more prominent. Some people find this stage easier than the first trimester. At the same time, the bump is growing noticeably and the centre of gravity gradually changes.

Approximate size: about 11–12 cm an avocado The NHS uses an avocado comparison.

How you may feel: Many people regain energy and have less nausea in the second trimester, but there is no universal pattern. As the bump grows and your centre of gravity changes, you may notice pulling at the sides of the abdomen, heartburn or a blocked nose.

Common variations: It can be normal not to feel movement yet, especially in a first pregnancy. First movements are often noticed between 16 and 24 weeks, so comparisons with someone else’s timeline are not helpful.

Useful information: Comfortable walks and pelvic-floor exercises often fit well at this stage if your clinician has not advised restrictions. Comfortable clothing and back support may matter more than before.

Checklist: Confirm which routine appointments fall in this period Pay attention to back comfort and posture Start noticing first movements when they actually occur

A little fact: First movements are sometimes described as butterflies or gentle bubbling, but many people feel them later.

More about your baby: The fetus actively moves arms and legs as facial muscles and coordination develop. Some people begin to feel movement, but the usual timing spans a wider range. Growth in length is especially noticeable now. Bones, muscles and nerve connections work together more effectively, and movements increase. A detail for this week: First movements are sometimes described as butterflies or gentle bubbling, but many people feel them later.

Development: Fat tissue begins to accumulate, helping with temperature regulation later. The skeleton strengthens and the umbilical cord thickens.

Body changes: The growing uterus shifts the centre of gravity and ligaments become more relaxed. Back or pelvic pain may increase.

Care: Physical activity is usually beneficial in an uncomplicated pregnancy, but a clinician should advise on individual restrictions.

This week’s highlight: Fat tissue begins to accumulate more actively, helping the baby retain warmth after birth.

Trimester: 🌿 Second trimester

Development stage: Beginning of the second trimester With the main organ structures in place, growth and maturation of the nervous system, bones, muscles and sensory structures become more prominent. Some people find this stage easier than the first trimester. At the same time, the bump is growing noticeably and the centre of gravity gradually changes.

Approximate size: about 12–13 cm a pomegranate The comparison helps show scale, but does not assess an individual baby’s growth.

How you may feel: Many people regain energy and have less nausea in the second trimester, but there is no universal pattern. As the bump grows and your centre of gravity changes, you may notice pulling at the sides of the abdomen, heartburn or a blocked nose.

Common variations: It can be normal not to feel movement yet, especially in a first pregnancy. First movements are often noticed between 16 and 24 weeks, so comparisons with someone else’s timeline are not helpful.

Useful information: Comfortable walks and pelvic-floor exercises often fit well at this stage if your clinician has not advised restrictions. Comfortable clothing and back support may matter more than before.

Checklist: Confirm which routine appointments fall in this period Pay attention to back comfort and posture Start noticing first movements when they actually occur

A little fact: Fat tissue begins to build up more actively, providing important future insulation.

More about your baby: Fat tissue begins to accumulate, helping with temperature regulation later. The skeleton strengthens and the umbilical cord thickens. Growth in length is especially noticeable now. Bones, muscles and nerve connections work together more effectively, and movements increase. A detail for this week: Fat tissue begins to build up more actively, providing important future insulation.

Development: Hearing, touch, swallowing and sucking reflexes develop. The fetus actively moves arms and legs, and some movements may now be felt.

Body changes: You may feel butterflies or light kicks. Back pain, heartburn and stretching skin are also possible.

Care: Many healthcare systems offer a detailed anatomy scan at about 18–21 weeks; local guidance determines the timing.

This week’s highlight: The hearing system develops and movements become stronger and more varied.

Trimester: 🌿 Second trimester

Development stage: Active movement and developing senses The nervous system becomes more complex, hearing structures develop further and movements can often be felt. Many care schedules include an anatomy ultrasound around this stage. The fetus moves actively, swallows amniotic fluid and responds to external stimuli. The skin is still thin, while protective coverings and fat tissue gradually develop.

Approximate size: about 14.2 cm a sweet pepper The NHS compares the size roughly to a bell pepper.

How you may feel: Movements may change from gentle flutters to clearer kicks. As the uterus grows, you may experience round-ligament pain, heartburn, leg cramps, headaches, changes in sleep and back pain.

Common variations: Movements may still be irregular without an established pattern at this stage. Bumps also vary widely: their appearance cannot be used to assess fetal growth at home.

Useful information: Many countries offer a detailed anatomy ultrasound around this stage, but the exact schedule depends on local guidance. Writing down questions about the scan beforehand can help.

Checklist: Confirm the anatomy-scan date if one is planned Find a comfortable sleeping position Do not compare movement frequency with other people’s accounts

A little fact: Hearing, touch, swallowing and sucking movements continue to mature.

More about your baby: Hearing, touch, swallowing and sucking reflexes develop. The fetus actively moves arms and legs, and some movements may now be felt. Sensory systems continue to mature and movements become stronger. The appearance is now recognisable, but many internal systems still have a long period of maturation ahead. A detail for this week: Hearing, touch, swallowing and sucking movements continue to mature.

Development: A protective coating called vernix starts to cover the skin. Sensory areas of the brain, hair and nerve connections continue to develop.

Body changes: As the uterus grows, ligaments may feel stretched, the back may tire more quickly and sleep may be less comfortable.

Care: If you can feel movements, do not compare their number with other pregnancies. Gradually learn your baby’s individual movement pattern.

This week’s highlight: Vernix begins to cover the skin, helping protect it in the amniotic fluid.

Trimester: 🌿 Second trimester

Development stage: Active movement and developing senses The nervous system becomes more complex, hearing structures develop further and movements can often be felt. Many care schedules include an anatomy ultrasound around this stage. The fetus moves actively, swallows amniotic fluid and responds to external stimuli. The skin is still thin, while protective coverings and fat tissue gradually develop.

Approximate size: about 15 cm a large tomato Before 20 weeks, length is usually given from crown to rump.

How you may feel: Movements may change from gentle flutters to clearer kicks. As the uterus grows, you may experience round-ligament pain, heartburn, leg cramps, headaches, changes in sleep and back pain.

Common variations: Movements may still be irregular without an established pattern at this stage. Bumps also vary widely: their appearance cannot be used to assess fetal growth at home.

Useful information: Many countries offer a detailed anatomy ultrasound around this stage, but the exact schedule depends on local guidance. Writing down questions about the scan beforehand can help.

Checklist: Confirm the anatomy-scan date if one is planned Find a comfortable sleeping position Do not compare movement frequency with other people’s accounts

A little fact: Vernix is a whitish protective coating that helps shield skin from prolonged contact with amniotic fluid.

More about your baby: A protective coating called vernix starts to cover the skin. Sensory areas of the brain, hair and nerve connections continue to develop. Sensory systems continue to mature and movements become stronger. The appearance is now recognisable, but many internal systems still have a long period of maturation ahead. A detail for this week: Vernix is a whitish protective coating that helps shield skin from prolonged contact with amniotic fluid.

Development: This is the midpoint of a 40-week pregnancy. Movements become stronger, the fetus swallows amniotic fluid, and the nervous system and organs continue to mature.

Body changes: The bump is usually clearly visible. Back pain, leg cramps, heartburn, constipation or skin changes may occur.

Care: The WHO model uses 20 weeks as a guide for the second antenatal contact. Many countries offer an anatomy ultrasound around this stage.

This week’s highlight: Half of the standard 40-week count has passed; anatomy scans are often performed around now.

Trimester: 🌿 Second trimester

Development stage: Active movement and developing senses The nervous system becomes more complex, hearing structures develop further and movements can often be felt. Many care schedules include an anatomy ultrasound around this stage. The fetus moves actively, swallows amniotic fluid and responds to external stimuli. The skin is still thin, while protective coverings and fat tissue gradually develop.

Approximate size: about 25.6 cm a banana From this stage, length is often measured from head to heel; the NHS compares it to a banana.

How you may feel: Movements may change from gentle flutters to clearer kicks. As the uterus grows, you may experience round-ligament pain, heartburn, leg cramps, headaches, changes in sleep and back pain.

Common variations: Movements may still be irregular without an established pattern at this stage. Bumps also vary widely: their appearance cannot be used to assess fetal growth at home.

Useful information: Many countries offer a detailed anatomy ultrasound around this stage, but the exact schedule depends on local guidance. Writing down questions about the scan beforehand can help.

Checklist: Confirm the anatomy-scan date if one is planned Find a comfortable sleeping position Do not compare movement frequency with other people’s accounts

A little fact: Around this stage, reported length often changes from crown-to-rump to head-to-heel measurement.

More about your baby: This is the midpoint of a 40-week pregnancy. Movements become stronger, the fetus swallows amniotic fluid, and the nervous system and organs continue to mature. Sensory systems continue to mature and movements become stronger. The appearance is now recognisable, but many internal systems still have a long period of maturation ahead. A detail for this week: Around this stage, reported length often changes from crown-to-rump to head-to-heel measurement.

Development: The fetus moves increasingly actively and responds to body position. The digestive system, bone marrow and nerve connections develop.

Body changes: Movements may become more regular, though intensity still varies greatly. The growing uterus may increase back and ligament discomfort.

Care: Do not wait for the next routine appointment if you have bleeding, severe pain or other concerning symptoms.

This week’s highlight: Movements become clearer as the nervous system rapidly builds new connections.

Trimester: 🌿 Second trimester

Development stage: Active movement and developing senses The nervous system becomes more complex, hearing structures develop further and movements can often be felt. Many care schedules include an anatomy ultrasound around this stage. The fetus moves actively, swallows amniotic fluid and responds to external stimuli. The skin is still thin, while protective coverings and fat tissue gradually develop.

Approximate size: about 26–27 cm a large carrot An approximate comparison for head-to-heel length.

How you may feel: Movements may change from gentle flutters to clearer kicks. As the uterus grows, you may experience round-ligament pain, heartburn, leg cramps, headaches, changes in sleep and back pain.

Common variations: Movements may still be irregular without an established pattern at this stage. Bumps also vary widely: their appearance cannot be used to assess fetal growth at home.

Useful information: Many countries offer a detailed anatomy ultrasound around this stage, but the exact schedule depends on local guidance. Writing down questions about the scan beforehand can help.

Checklist: Confirm the anatomy-scan date if one is planned Find a comfortable sleeping position Do not compare movement frequency with other people’s accounts

A little fact: Arm and leg movements are already well coordinated by the nervous system.

More about your baby: The fetus moves increasingly actively and responds to body position. The digestive system, bone marrow and nerve connections develop. Sensory systems continue to mature and movements become stronger. The appearance is now recognisable, but many internal systems still have a long period of maturation ahead. A detail for this week: Arm and leg movements are already well coordinated by the nervous system.

Development: Eyebrows and fine hairs become more visible, while the skin remains thin and wrinkled. The lungs and nervous system continue to develop intensively.

Body changes: Heartburn, haemorrhoids, back pain, leg cramps and swelling may occur, especially later in the day.

Care: Sudden or marked swelling of the face and hands, particularly with a severe headache or visual changes, needs urgent medical assessment.

This week’s highlight: The skin is still thin, but more fat tissue gradually begins to build underneath it.

Trimester: 🌿 Second trimester

Development stage: Active movement and developing senses The nervous system becomes more complex, hearing structures develop further and movements can often be felt. Many care schedules include an anatomy ultrasound around this stage. The fetus moves actively, swallows amniotic fluid and responds to external stimuli. The skin is still thin, while protective coverings and fat tissue gradually develop.

Approximate size: about 28 cm a sweet potato Actual measurements naturally vary.

How you may feel: Movements may change from gentle flutters to clearer kicks. As the uterus grows, you may experience round-ligament pain, heartburn, leg cramps, headaches, changes in sleep and back pain.

Common variations: Movements may still be irregular without an established pattern at this stage. Bumps also vary widely: their appearance cannot be used to assess fetal growth at home.

Useful information: Many countries offer a detailed anatomy ultrasound around this stage, but the exact schedule depends on local guidance. Writing down questions about the scan beforehand can help.

Checklist: Confirm the anatomy-scan date if one is planned Find a comfortable sleeping position Do not compare movement frequency with other people’s accounts

A little fact: The skin is still very thin and wrinkled because there is little fat beneath it.

More about your baby: Eyebrows and fine hairs become more visible, while the skin remains thin and wrinkled. The lungs and nervous system continue to develop intensively. Sensory systems continue to mature and movements become stronger. The appearance is now recognisable, but many internal systems still have a long period of maturation ahead. A detail for this week: The skin is still very thin and wrinkled because there is little fat beneath it.

Development: Hearing becomes more sensitive to sounds outside the uterus. The network of breathing structures in the lungs continues to form, but remains immature.

Body changes: The weight of the uterus and a shifting centre of gravity may increase strain on the back and pelvis. Fetal movements usually become clearer.

Care: Keep routine appointments even if you feel well. Some changes, such as high blood pressure, may not cause noticeable symptoms.

This week’s highlight: The fetus responds more to sounds and actively practises movements needed after birth.

Trimester: 🌿 Second trimester

Development stage: Maturing lungs and nervous system The lungs are not yet ready for fully independent breathing, but their internal structure is developing quickly. The brain forms increasingly complex connections. The second trimester ends at the close of this stage. Sleep and activity cycles become more noticeable, and movements grow stronger and more varied.

Approximate size: about 29 cm a grapefruit The comparison only helps you picture the scale.

How you may feel: As the bump becomes heavier, heartburn, back pain, leg cramps, pressure and disrupted sleep may become more common. Movements usually feel clearer, and you may sometimes notice rhythmic hiccups.

Common variations: Fetal activity normally varies during the day. Gradually get to know this baby’s usual movement pattern rather than looking for a single number that applies to everyone.

Useful information: Many care schedules assess gestational-diabetes risk or offer testing at 24–28 weeks. Ask your clinician which tests are planned for you.

Checklist: Confirm tests planned for 24–28 weeks Look after back and leg comfort Gradually learn your baby’s usual movement pattern

A little fact: Sounds from outside can already trigger a movement response.

More about your baby: Hearing becomes more sensitive to sounds outside the uterus. The network of breathing structures in the lungs continues to form, but remains immature. The lungs actively prepare for future breathing while the brain builds new nerve connections. Movement, swallowing and responses to sound become more noticeable parts of development. A detail for this week: Sounds from outside can already trigger a movement response.

Development: The lungs continue forming small structures for future gas exchange and begin producing substances needed after birth. The nervous system matures rapidly.

Body changes: Stretching skin, rib or back pain, heartburn and a feeling of pressure may increase.

Care: If you have not felt any movements by 24 weeks, tell your doctor or midwife. Any assessment depends on your individual care plan.

This week’s highlight: The lungs remain immature, but their internal structure is actively preparing for future gas exchange.

Trimester: 🌿 Second trimester

Development stage: Maturing lungs and nervous system The lungs are not yet ready for fully independent breathing, but their internal structure is developing quickly. The brain forms increasingly complex connections. The second trimester ends at the close of this stage. Sleep and activity cycles become more noticeable, and movements grow stronger and more varied.

Approximate size: about 30 cm an ear of corn Growth becomes more noticeable and weight increases faster.

How you may feel: As the bump becomes heavier, heartburn, back pain, leg cramps, pressure and disrupted sleep may become more common. Movements usually feel clearer, and you may sometimes notice rhythmic hiccups.

Common variations: Fetal activity normally varies during the day. Gradually get to know this baby’s usual movement pattern rather than looking for a single number that applies to everyone.

Useful information: Many care schedules assess gestational-diabetes risk or offer testing at 24–28 weeks. Ask your clinician which tests are planned for you.

Checklist: Confirm tests planned for 24–28 weeks Look after back and leg comfort Gradually learn your baby’s usual movement pattern

A little fact: The lungs are building structures for future gas exchange, although they are not yet ready to breathe air independently.

More about your baby: The lungs continue forming small structures for future gas exchange and begin producing substances needed after birth. The nervous system matures rapidly. The lungs actively prepare for future breathing while the brain builds new nerve connections. Movement, swallowing and responses to sound become more noticeable parts of development. A detail for this week: The lungs are building structures for future gas exchange, although they are not yet ready to breathe air independently.

Development: The fetus may move in response to loud sounds and may hiccup. The kidneys produce urine, which forms part of the amniotic fluid.

Body changes: Heartburn, constipation, back and pelvic pain may increase. The growing uterus changes the position of internal organs.

Care: Many care schedules assess risk or test for gestational diabetes at about 24–28 weeks. The approach depends on the country and individual risk factors.

This week’s highlight: Responses to loud sounds become more noticeable as the nervous system improves coordination.

Trimester: 🌿 Second trimester

Development stage: Maturing lungs and nervous system The lungs are not yet ready for fully independent breathing, but their internal structure is developing quickly. The brain forms increasingly complex connections. The second trimester ends at the close of this stage. Sleep and activity cycles become more noticeable, and movements grow stronger and more varied.

Approximate size: about 34.6 cm a courgette The NHS compares the size roughly to a courgette.

How you may feel: As the bump becomes heavier, heartburn, back pain, leg cramps, pressure and disrupted sleep may become more common. Movements usually feel clearer, and you may sometimes notice rhythmic hiccups.

Common variations: Fetal activity normally varies during the day. Gradually get to know this baby’s usual movement pattern rather than looking for a single number that applies to everyone.

Useful information: Many care schedules assess gestational-diabetes risk or offer testing at 24–28 weeks. Ask your clinician which tests are planned for you.

Checklist: Confirm tests planned for 24–28 weeks Look after back and leg comfort Gradually learn your baby’s usual movement pattern

A little fact: Fetal hiccups may feel like a series of gentle rhythmic movements.

More about your baby: The fetus may move in response to loud sounds and may hiccup. The kidneys produce urine, which forms part of the amniotic fluid. The lungs actively prepare for future breathing while the brain builds new nerve connections. Movement, swallowing and responses to sound become more noticeable parts of development. A detail for this week: Fetal hiccups may feel like a series of gentle rhythmic movements.

Development: The eyelids may begin to open and hearing and responses to sound improve. The lungs produce more surfactant but remain immature.

Body changes: Painless irregular uterine contractions, heaviness, heartburn or sleep problems may occur.

Care: The WHO model uses 26 weeks as a guide for the third antenatal contact. Your local schedule may differ.

This week’s highlight: The eyelids may open as the lungs produce more of the substances needed to function after birth.

Trimester: 🌿 Second trimester

Development stage: Maturing lungs and nervous system The lungs are not yet ready for fully independent breathing, but their internal structure is developing quickly. The brain forms increasingly complex connections. The second trimester ends at the close of this stage. Sleep and activity cycles become more noticeable, and movements grow stronger and more varied.

Approximate size: about 35–36 cm a leek Length now exceeds one third of a metre.

How you may feel: As the bump becomes heavier, heartburn, back pain, leg cramps, pressure and disrupted sleep may become more common. Movements usually feel clearer, and you may sometimes notice rhythmic hiccups.

Common variations: Fetal activity normally varies during the day. Gradually get to know this baby’s usual movement pattern rather than looking for a single number that applies to everyone.

Useful information: Many care schedules assess gestational-diabetes risk or offer testing at 24–28 weeks. Ask your clinician which tests are planned for you.

Checklist: Confirm tests planned for 24–28 weeks Look after back and leg comfort Gradually learn your baby’s usual movement pattern

A little fact: The eyelids may begin to open and the eyes respond to changes in light.

More about your baby: The eyelids may begin to open and hearing and responses to sound improve. The lungs produce more surfactant but remain immature. The lungs actively prepare for future breathing while the brain builds new nerve connections. Movement, swallowing and responses to sound become more noticeable parts of development. A detail for this week: The eyelids may begin to open and the eyes respond to changes in light.

Development: The brain rapidly forms new connections and sleep and activity cycles become clearer. The lungs, eyes and nervous system continue to mature.

Body changes: A growing bump may make sleeping or sitting and standing for long periods harder. Breathlessness during activity and heartburn may occur.

Care: This is the end of the second trimester. The third trimester starts at 28 weeks.

This week’s highlight: The second trimester is ending: the brain develops rapidly and sleep and activity cycles become more distinct.

Trimester: 🌿 Second trimester

Development stage: Maturing lungs and nervous system The lungs are not yet ready for fully independent breathing, but their internal structure is developing quickly. The brain forms increasingly complex connections. The second trimester ends at the close of this stage. Sleep and activity cycles become more noticeable, and movements grow stronger and more varied.

Approximate size: about 36–37 cm a cauliflower An approximate comparison to show scale.

How you may feel: As the bump becomes heavier, heartburn, back pain, leg cramps, pressure and disrupted sleep may become more common. Movements usually feel clearer, and you may sometimes notice rhythmic hiccups.

Common variations: Fetal activity normally varies during the day. Gradually get to know this baby’s usual movement pattern rather than looking for a single number that applies to everyone.

Useful information: Many care schedules assess gestational-diabetes risk or offer testing at 24–28 weeks. Ask your clinician which tests are planned for you.

Checklist: Confirm tests planned for 24–28 weeks Look after back and leg comfort Gradually learn your baby’s usual movement pattern

A little fact: Sleep and activity cycles become clearer, but do not match an adult’s routine.

More about your baby: The brain rapidly forms new connections and sleep and activity cycles become clearer. The lungs, eyes and nervous system continue to mature. The lungs actively prepare for future breathing while the brain builds new nerve connections. Movement, swallowing and responses to sound become more noticeable parts of development. A detail for this week: Sleep and activity cycles become clearer, but do not match an adult’s routine.

Development: The third trimester begins. The fetus gains weight actively, the brain and lungs keep maturing and the eyes may open.

Body changes: Strain on the back and pelvis increases, with possible heartburn, swelling and disturbed sleep. Movements should continue in the pattern usual for this pregnancy.

Care: If movements become weaker, less frequent or different from their usual pattern, contact maternity services immediately rather than waiting until the next day.

This week’s highlight: The third trimester begins, with particularly active weight gain and organ maturation.

Trimester: 🌸 Third trimester

Development stage: Beginning of the third trimester Weight gain becomes especially active as the lungs, brain and nervous system mature. More fat tissue accumulates under the skin. There is less room in the uterus, so movements may gradually feel different, but they should remain a regular part of your everyday experience of pregnancy.

Approximate size: about 37.6 cm an aubergine The NHS compares the size roughly to an aubergine.

How you may feel: The third trimester often brings tiredness back. The bump is larger, sleep may be interrupted, and heartburn and the need to urinate can become more persistent. Pressure and irregular practice contractions may increase.

Common variations: Movement can feel different as space becomes tighter, but it should not simply disappear. Needing more rest and changing position more often are also common.

Useful information: Consider practical preparations for birth: maternity-unit contacts, transport, a packing list and questions about feeding and recovery. This does not mean labour is imminent; getting organised can reduce the load later.

Checklist: Check maternity-unit or clinician contact details Start a packing list without rushing Know your baby’s usual movement pattern

A little fact: The fetal heart beats faster than an adult heart, a normal feature of circulation before birth.

More about your baby: The third trimester begins. The fetus gains weight actively, the brain and lungs keep maturing and the eyes may open. The main focus shifts towards maturation and weight gain. The brain and lungs continue to develop intensively, while more fat accumulates under the skin. A detail for this week: The fetal heart beats faster than an adult heart, a normal feature of circulation before birth.

Development: The main structures are formed; organ maturation and accumulation of fat now matter most. Fine lanugo hair decreases and the vernix coating changes.

Body changes: The uterus takes up more space, which may increase heartburn, breathlessness during activity and frequent urination.

Care: Pay attention to this baby’s usual movement pattern rather than a universal kick count. Changes need assessment.

This week’s highlight: The main focus at this stage is growth and maturation, rather than forming new organs from scratch.

Trimester: 🌸 Third trimester

Development stage: Beginning of the third trimester Weight gain becomes especially active as the lungs, brain and nervous system mature. More fat tissue accumulates under the skin. There is less room in the uterus, so movements may gradually feel different, but they should remain a regular part of your everyday experience of pregnancy.

Approximate size: about 38–39 cm a butternut squash Weight gain becomes increasingly important in the third trimester.

How you may feel: The third trimester often brings tiredness back. The bump is larger, sleep may be interrupted, and heartburn and the need to urinate can become more persistent. Pressure and irregular practice contractions may increase.

Common variations: Movement can feel different as space becomes tighter, but it should not simply disappear. Needing more rest and changing position more often are also common.

Useful information: Consider practical preparations for birth: maternity-unit contacts, transport, a packing list and questions about feeding and recovery. This does not mean labour is imminent; getting organised can reduce the load later.

Checklist: Check maternity-unit or clinician contact details Start a packing list without rushing Know your baby’s usual movement pattern

A little fact: The pace of weight gain becomes especially noticeable during the third trimester.

More about your baby: The main structures are formed; organ maturation and accumulation of fat now matter most. Fine lanugo hair decreases and the vernix coating changes. The main focus shifts towards maturation and weight gain. The brain and lungs continue to develop intensively, while more fat accumulates under the skin. A detail for this week: The pace of weight gain becomes especially noticeable during the third trimester.

Development: The brain, lungs and nervous system continue to mature, while bone marrow contributes more to blood-cell production. The fetus gains weight quickly.

Body changes: The pelvic floor, back and legs carry more load. Swelling, tiredness and irregular practice contractions may occur.

Care: Thirty weeks is one of the WHO model’s antenatal-contact points. Blood pressure and general health assessment matter at each contact.

This week’s highlight: The brain, lungs and nervous system continue to mature while the fetus gains weight rapidly.

Trimester: 🌸 Third trimester

Development stage: Beginning of the third trimester Weight gain becomes especially active as the lungs, brain and nervous system mature. More fat tissue accumulates under the skin. There is less room in the uterus, so movements may gradually feel different, but they should remain a regular part of your everyday experience of pregnancy.

Approximate size: about 40 cm a cabbage The baby continues to grow, but individual measurements already vary widely.

How you may feel: The third trimester often brings tiredness back. The bump is larger, sleep may be interrupted, and heartburn and the need to urinate can become more persistent. Pressure and irregular practice contractions may increase.

Common variations: Movement can feel different as space becomes tighter, but it should not simply disappear. Needing more rest and changing position more often are also common.

Useful information: Consider practical preparations for birth: maternity-unit contacts, transport, a packing list and questions about feeding and recovery. This does not mean labour is imminent; getting organised can reduce the load later.

Checklist: Check maternity-unit or clinician contact details Start a packing list without rushing Know your baby’s usual movement pattern

A little fact: The cerebral cortex becomes increasingly complex: brain development is far from finished.

More about your baby: The brain, lungs and nervous system continue to mature, while bone marrow contributes more to blood-cell production. The fetus gains weight quickly. The main focus shifts towards maturation and weight gain. The brain and lungs continue to develop intensively, while more fat accumulates under the skin. A detail for this week: The cerebral cortex becomes increasingly complex: brain development is far from finished.

Development: The nervous system coordinates movements and responses more effectively. The lungs are still maturing and fat continues to accumulate under the skin.

Body changes: Sleep may be disrupted by fetal movements, heartburn, frequent urination or an uncomfortable position.

Care: Discuss preparation for birth, feeding and when to contact the maternity unit with your care professional.

This week’s highlight: Movements are well coordinated and space in the uterus gradually becomes tighter.

Trimester: 🌸 Third trimester

Development stage: Beginning of the third trimester Weight gain becomes especially active as the lungs, brain and nervous system mature. More fat tissue accumulates under the skin. There is less room in the uterus, so movements may gradually feel different, but they should remain a regular part of your everyday experience of pregnancy.

Approximate size: about 41 cm a coconut An everyday comparison does not replace ultrasound assessment of growth.

How you may feel: The third trimester often brings tiredness back. The bump is larger, sleep may be interrupted, and heartburn and the need to urinate can become more persistent. Pressure and irregular practice contractions may increase.

Common variations: Movement can feel different as space becomes tighter, but it should not simply disappear. Needing more rest and changing position more often are also common.

Useful information: Consider practical preparations for birth: maternity-unit contacts, transport, a packing list and questions about feeding and recovery. This does not mean labour is imminent; getting organised can reduce the load later.

Checklist: Check maternity-unit or clinician contact details Start a packing list without rushing Know your baby’s usual movement pattern

A little fact: The fetus may have fairly distinct active periods that the pregnant person recognises well.

More about your baby: The nervous system coordinates movements and responses more effectively. The lungs are still maturing and fat continues to accumulate under the skin. The main focus shifts towards maturation and weight gain. The brain and lungs continue to develop intensively, while more fat accumulates under the skin. A detail for this week: The fetus may have fairly distinct active periods that the pregnant person recognises well.

Development: The body structures are formed, but weight gain and maturation continue. Many babies are head down, although position may still change.

Body changes: Movements may feel different as space becomes tighter, but should not simply disappear or become substantially weaker.

Care: Contact maternity services immediately if movements decrease or their usual pattern changes. A home Doppler does not replace clinical assessment.

This week’s highlight: Many babies are head down by now, although their position may still change.

Trimester: 🌸 Third trimester

Development stage: Final maturation before birth The organs are formed, but the brain, lungs and nervous system continue to mature. Many babies move into a head-down position around this time. The growing bump has a greater effect on sleep, the back, pelvis and breathing during activity. This is why the final weeks can feel more physically demanding.

Approximate size: about 42 cm a large papaya An approximate visual comparison.

How you may feel: The size of the uterus may make it harder to sit, walk or sleep in one position for long. Pressure on the pelvis and bladder increases, while breathlessness during activity, heartburn and tiredness become more common.

Common variations: Movements may feel larger and slower as space becomes tighter. However, less space does not mean the baby should move progressively less or stop being active.

Useful information: Finish practical arrangements, discuss your birth preferences and find out what to do with regular contractions or if your waters break. If the baby is not head down, discuss their position with your clinician.

Checklist: Finish basic preparations for birth Confirm whom to call when labour starts Discuss the baby’s position at a routine appointment

A little fact: A head-down position is common, but is not the only possible position yet.

More about your baby: The body structures are formed, but weight gain and maturation continue. Many babies are head down, although position may still change. The organs are formed, but development is not finished. Continued maturation of the brain, lungs and nervous system is particularly important. A detail for this week: A head-down position is common, but is not the only possible position yet.

Development: The brain and nervous system continue to mature. Most bones harden, while skull bones remain flexible and do not fuse before birth.

Body changes: Tiredness, heartburn, swelling and back or pelvic pain may occur. The bump can limit your usual movement.

Care: This is a useful time to finish practical birth arrangements and have a clear plan for contacting the maternity unit.

This week’s highlight: Body bones harden, but skull bones remain flexible, which matters during birth.

Trimester: 🌸 Third trimester

Development stage: Final maturation before birth The organs are formed, but the brain, lungs and nervous system continue to mature. Many babies move into a head-down position around this time. The growing bump has a greater effect on sleep, the back, pelvis and breathing during activity. This is why the final weeks can feel more physically demanding.

Approximate size: about 44 cm a pineapple Fat tissue accumulates actively at this stage.

How you may feel: The size of the uterus may make it harder to sit, walk or sleep in one position for long. Pressure on the pelvis and bladder increases, while breathlessness during activity, heartburn and tiredness become more common.

Common variations: Movements may feel larger and slower as space becomes tighter. However, less space does not mean the baby should move progressively less or stop being active.

Useful information: Finish practical arrangements, discuss your birth preferences and find out what to do with regular contractions or if your waters break. If the baby is not head down, discuss their position with your clinician.

Checklist: Finish basic preparations for birth Confirm whom to call when labour starts Discuss the baby’s position at a routine appointment

A little fact: Flexible skull bones help the head pass through the birth canal.

More about your baby: The brain and nervous system continue to mature. Most bones harden, while skull bones remain flexible and do not fuse before birth. The organs are formed, but development is not finished. Continued maturation of the brain, lungs and nervous system is particularly important. A detail for this week: Flexible skull bones help the head pass through the birth canal.

Development: The lungs, brain and digestive system continue to mature as the fat layer increases. The skin becomes less wrinkled.

Body changes: Pressure on the bladder and pelvis may increase, and practice contractions may become more noticeable.

Care: The WHO model includes an antenatal contact at around 34 weeks. Your maternity team determines your individual schedule.

This week’s highlight: The lungs and brain are still maturing, even though the body already looks much like a newborn’s.

Trimester: 🌸 Third trimester

Development stage: Final maturation before birth The organs are formed, but the brain, lungs and nervous system continue to mature. Many babies move into a head-down position around this time. The growing bump has a greater effect on sleep, the back, pelvis and breathing during activity. This is why the final weeks can feel more physically demanding.

Approximate size: about 45 cm a cantaloupe melon Measurements can now differ noticeably between babies.

How you may feel: The size of the uterus may make it harder to sit, walk or sleep in one position for long. Pressure on the pelvis and bladder increases, while breathlessness during activity, heartburn and tiredness become more common.

Common variations: Movements may feel larger and slower as space becomes tighter. However, less space does not mean the baby should move progressively less or stop being active.

Useful information: Finish practical arrangements, discuss your birth preferences and find out what to do with regular contractions or if your waters break. If the baby is not head down, discuss their position with your clinician.

Checklist: Finish basic preparations for birth Confirm whom to call when labour starts Discuss the baby’s position at a routine appointment

A little fact: Functional maturation continues even after all the main organs have formed.

More about your baby: The lungs, brain and digestive system continue to mature as the fat layer increases. The skin becomes less wrinkled. The organs are formed, but development is not finished. Continued maturation of the brain, lungs and nervous system is particularly important. A detail for this week: Functional maturation continues even after all the main organs have formed.

Development: The fetus continues to gain weight actively. The kidneys function, the liver performs some of its future tasks and the lungs continue maturing.

Body changes: Walking, sitting or sleeping in one position for long may become harder. Frequent urination and heartburn are very common.

Care: Make sure you recognise possible signs of labour and know where to seek advice if your waters break, bleeding occurs or contractions become regular and painful.

This week’s highlight: The kidneys work, the liver performs some of its future functions and the body keeps accumulating fat.

Trimester: 🌸 Third trimester

Development stage: Final maturation before birth The organs are formed, but the brain, lungs and nervous system continue to mature. Many babies move into a head-down position around this time. The growing bump has a greater effect on sleep, the back, pelvis and breathing during activity. This is why the final weeks can feel more physically demanding.

Approximate size: about 46 cm a large melon Maturation and weight gain are the main themes of the final weeks.

How you may feel: The size of the uterus may make it harder to sit, walk or sleep in one position for long. Pressure on the pelvis and bladder increases, while breathlessness during activity, heartburn and tiredness become more common.

Common variations: Movements may feel larger and slower as space becomes tighter. However, less space does not mean the baby should move progressively less or stop being active.

Useful information: Finish practical arrangements, discuss your birth preferences and find out what to do with regular contractions or if your waters break. If the baby is not head down, discuss their position with your clinician.

Checklist: Finish basic preparations for birth Confirm whom to call when labour starts Discuss the baby’s position at a routine appointment

A little fact: The kidneys work and the liver gradually takes on more functions.

More about your baby: The fetus continues to gain weight actively. The kidneys function, the liver performs some of its future tasks and the lungs continue maturing. The organs are formed, but development is not finished. Continued maturation of the brain, lungs and nervous system is particularly important. A detail for this week: The kidneys work and the liver gradually takes on more functions.

Development: Many babies are now head down, while others remain in a different position. The lungs and brain keep maturing even late in pregnancy.

Body changes: The head may move lower into the pelvis, sometimes making breathing easier while increasing pressure on the lower abdomen and bladder.

Care: If the baby is not head down, your clinician may discuss management options, including external cephalic version when appropriate.

This week’s highlight: In many pregnancies, the baby is already in position for birth, but other positions remain possible.

Trimester: 🌸 Third trimester

Development stage: Final maturation before birth The organs are formed, but the brain, lungs and nervous system continue to mature. Many babies move into a head-down position around this time. The growing bump has a greater effect on sleep, the back, pelvis and breathing during activity. This is why the final weeks can feel more physically demanding.

Approximate size: about 47 cm a head of romaine lettuce An approximate comparison for length.

How you may feel: The size of the uterus may make it harder to sit, walk or sleep in one position for long. Pressure on the pelvis and bladder increases, while breathlessness during activity, heartburn and tiredness become more common.

Common variations: Movements may feel larger and slower as space becomes tighter. However, less space does not mean the baby should move progressively less or stop being active.

Useful information: Finish practical arrangements, discuss your birth preferences and find out what to do with regular contractions or if your waters break. If the baby is not head down, discuss their position with your clinician.

Checklist: Finish basic preparations for birth Confirm whom to call when labour starts Discuss the baby’s position at a routine appointment

A little fact: The head moving down into the pelvis can change the shape of the bump and the feeling of pressure.

More about your baby: Many babies are now head down, while others remain in a different position. The lungs and brain keep maturing even late in pregnancy. The organs are formed, but development is not finished. Continued maturation of the brain, lungs and nervous system is particularly important. A detail for this week: The head moving down into the pelvis can change the shape of the bump and the feeling of pressure.

Development: In ACOG’s classification, early term begins at 37+0 and continues through 38+6. The brain, lungs and other organs are still maturing.

Body changes: Pelvic pressure, increased mucus discharge and irregular contractions may occur. These changes do not all mean labour will begin immediately.

Care: Follow your maternity unit’s instructions about regular contractions, waters breaking or any bleeding.

This week’s highlight: From 37+0, pregnancy is considered early term, but the brain and lungs continue to mature.

Trimester: 🌸 Third trimester

Development stage: Early term Pregnancy is now considered early term, but development continues: the lungs and brain are still maturing. Labour can begin in different ways. Irregular contractions, pelvic pressure and changes in discharge do not always mean birth will happen immediately.

Approximate size: about 48–49 cm a large bunch of chard Early term begins at 37+0.

How you may feel: Pelvic pressure, disrupted sleep, frequent urination and practice contractions may be especially noticeable. Sometimes the head moves lower, making breathing easier while increasing pressure low in the abdomen.

Common variations: Labour does not have to start exactly on the estimated due date. Signs of approaching labour vary, and irregular contractions can begin well before active labour.

Useful information: The most useful preparation is clear guidance from your maternity unit: when to call, when to travel in and what to do if your waters break. Keep your bag and documents ready.

Checklist: Check your documents and maternity bag Know your maternity unit’s guidance Do not wait if your baby’s usual movements change noticeably

A little fact: At 37+0, pregnancy is term, but is called early term rather than full term.

More about your baby: In ACOG’s classification, early term begins at 37+0 and continues through 38+6. The brain, lungs and other organs are still maturing. Development continues even at term. The brain, lungs, fat stores and systems that support adaptation after birth keep changing until delivery. A detail for this week: At 37+0, pregnancy is term, but is called early term rather than full term.

Development: Early term continues. The fetus accumulates fat, practises breathing movements and prepares to breathe independently after birth.

Body changes: Sleep is often interrupted and pelvic pressure may increase. Movements remain an important sign of the baby’s wellbeing.

Care: Movements should not stop even at the end of pregnancy. Seek help immediately if their usual pattern changes noticeably.

This week’s highlight: The fetus prepares for independent breathing and life outside the uterus, but development does not stop.

Trimester: 🌸 Third trimester

Development stage: Early term Pregnancy is now considered early term, but development continues: the lungs and brain are still maturing. Labour can begin in different ways. Irregular contractions, pelvic pressure and changes in discharge do not always mean birth will happen immediately.

Approximate size: about 49–50 cm a large leek Actual length and weight naturally vary widely.

How you may feel: Pelvic pressure, disrupted sleep, frequent urination and practice contractions may be especially noticeable. Sometimes the head moves lower, making breathing easier while increasing pressure low in the abdomen.

Common variations: Labour does not have to start exactly on the estimated due date. Signs of approaching labour vary, and irregular contractions can begin well before active labour.

Useful information: The most useful preparation is clear guidance from your maternity unit: when to call, when to travel in and what to do if your waters break. Keep your bag and documents ready.

Checklist: Check your documents and maternity bag Know your maternity unit’s guidance Do not wait if your baby’s usual movements change noticeably

A little fact: The baby continues to accumulate fat and mature even when the pregnancy is considered term.

More about your baby: Early term continues. The fetus accumulates fat, practises breathing movements and prepares to breathe independently after birth. Development continues even at term. The brain, lungs, fat stores and systems that support adaptation after birth keep changing until delivery. A detail for this week: The baby continues to accumulate fat and mature even when the pregnancy is considered term.

Development: Full term begins at 39+0. The organs are ready for life outside the uterus, but the brain and lungs keep maturing until birth.

Body changes: Regular or irregular contractions, pelvic pressure and changes in mucus discharge may occur. Labour begins differently for each person.

Care: Make sure you know your maternity unit’s instructions: when to call, when to travel in and what to do if your waters break.

This week’s highlight: Full term begins at 39+0, one of the most common periods for labour to start.

Trimester: 🌸 Third trimester

Development stage: Full term This is a common time for labour to begin spontaneously. The baby is ready for life outside the uterus, although the brain and lungs keep maturing until birth. Forty weeks is an estimated due date, not an exact deadline. Pregnancy length naturally varies.

Approximate size: about 50 cm a small pumpkin Full term begins at 39+0.

How you may feel: Pelvic pressure, disrupted sleep, frequent urination and practice contractions may be especially noticeable. Sometimes the head moves lower, making breathing easier while increasing pressure low in the abdomen.

Common variations: Labour does not have to start exactly on the estimated due date. Signs of approaching labour vary, and irregular contractions can begin well before active labour.

Useful information: The most useful preparation is clear guidance from your maternity unit: when to call, when to travel in and what to do if your waters break. Keep your bag and documents ready.

Checklist: Check your documents and maternity bag Know your maternity unit’s guidance Do not wait if your baby’s usual movements change noticeably

A little fact: ACOG defines 39+0–40+6 as full term.

More about your baby: Full term begins at 39+0. The organs are ready for life outside the uterus, but the brain and lungs keep maturing until birth. Development continues even at term. The brain, lungs, fat stores and systems that support adaptation after birth keep changing until delivery. A detail for this week: ACOG defines 39+0–40+6 as full term.

Development: Forty weeks is the usual point used for the estimated due date. The fetus should continue moving in their usual pattern right up to labour.

Body changes: Practice contractions may increase or develop into regular labour contractions. Waters may break as a gush or a small trickle.

Care: The estimated due date is not a deadline. If labour has not started, discuss further monitoring and possible induction with your clinician.

This week’s highlight: Forty weeks is the estimated due-date point, not a rigid deadline for birth.

Trimester: 🌸 Third trimester

Development stage: Full term This is a common time for labour to begin spontaneously. The baby is ready for life outside the uterus, although the brain and lungs keep maturing until birth. Forty weeks is an estimated due date, not an exact deadline. Pregnancy length naturally varies.

Approximate size: about 51 cm a pumpkin or small watermelon The due date is an estimate, not a date on which labour must begin.

How you may feel: Pelvic pressure, disrupted sleep, frequent urination and practice contractions may be especially noticeable. Sometimes the head moves lower, making breathing easier while increasing pressure low in the abdomen.

Common variations: Labour does not have to start exactly on the estimated due date. Signs of approaching labour vary, and irregular contractions can begin well before active labour.

Useful information: The most useful preparation is clear guidance from your maternity unit: when to call, when to travel in and what to do if your waters break. Keep your bag and documents ready.

Checklist: Check your documents and maternity bag Know your maternity unit’s guidance Do not wait if your baby’s usual movements change noticeably

A little fact: The due date is a statistical guide; many births do not happen on that exact date.

More about your baby: Forty weeks is the usual point used for the estimated due date. The fetus should continue moving in their usual pattern right up to labour. Development continues even at term. The brain, lungs, fat stores and systems that support adaptation after birth keep changing until delivery. A detail for this week: The due date is a statistical guide; many births do not happen on that exact date.

Development: This is late term. The baby continues to receive oxygen and nutrients through the placenta, but risks gradually increase beyond 41 weeks.

Body changes: Waiting can be physically and emotionally tiring. Fetal movements should stay in their usual pattern.

Care: At 41 weeks, have a specific plan with your clinician for monitoring and the timing of possible birth or induction.

This week’s highlight: Week 41 is late term and requires a clear monitoring plan agreed with your clinician.

Trimester: 🌸 Third trimester

Development stage: Late term and post-term Monitoring becomes especially important after 41 weeks. From 42+0, pregnancy is classified as post-term. At this stage, a calendar should not guide decisions. Your care team should agree the monitoring plan and approach to birth with you.

Approximate size: on average about 3–4 kg a small pumpkin or watermelon The NHS uses this everyday comparison at week 41.

How you may feel: Waiting beyond the due date can be physically and emotionally tiring. How you feel does not show how the placenta is functioning or how the baby is doing, so an agreed monitoring plan is especially important.

Common variations: Labour does not always begin by the due date. However, after 41 weeks, decisions about further waiting, monitoring or induction should be made with your maternity team.

Useful information: Do not use an online calendar as instructions at this stage. You need a specific monitoring plan and guidance on timing of birth from your clinician or maternity unit.

Checklist: Have an agreed monitoring plan Know the date of your next assessment or contact Seek help immediately if movements change

A little fact: Beyond 41 weeks, the maternity team usually discusses monitoring and induction in more detail.

More about your baby: This is late term. The baby continues to receive oxygen and nutrients through the placenta, but risks gradually increase beyond 41 weeks. Development continues even at term. The brain, lungs, fat stores and systems that support adaptation after birth keep changing until delivery. A detail for this week: Beyond 41 weeks, the maternity team usually discusses monitoring and induction in more detail.

Development: From 42+0, pregnancy is classified as post-term. Further waiting requires an individual clinical decision and monitoring.

Body changes: How you feel cannot reliably show the condition of the placenta or fetus, so a calendar cannot replace clinical assessment.

Care: If you have reached 42 weeks, do not rely on an online tool. Contact the maternity team responsible for your care directly.

This week’s highlight: From 42+0, pregnancy is classified as post-term; an online guide cannot replace medical monitoring.

Trimester: 🌸 Third trimester

Development stage: Late term and post-term Monitoring becomes especially important after 41 weeks. From 42+0, pregnancy is classified as post-term. At this stage, a calendar should not guide decisions. Your care team should agree the monitoring plan and approach to birth with you.

Approximate size: highly individual a term baby From 42+0, pregnancy is post-term. Size is assessed clinically, not through everyday comparisons.

How you may feel: Waiting beyond the due date can be physically and emotionally tiring. How you feel does not show how the placenta is functioning or how the baby is doing, so an agreed monitoring plan is especially important.

Common variations: Labour does not always begin by the due date. However, after 41 weeks, decisions about further waiting, monitoring or induction should be made with your maternity team.

Useful information: Do not use an online calendar as instructions at this stage. You need a specific monitoring plan and guidance on timing of birth from your clinician or maternity unit.

Checklist: Have an agreed monitoring plan Know the date of your next assessment or contact Seek help immediately if movements change

A little fact: The term post-term pregnancy applies from 42+0.

More about your baby: From 42+0, pregnancy is classified as post-term. Further waiting requires an individual clinical decision and monitoring. Development continues even at term. The brain, lungs, fat stores and systems that support adaptation after birth keep changing until delivery. A detail for this week: The term post-term pregnancy applies from 42+0.