Pregnancy Week 40
Pregnancy Week 40
What to expect on pregnancy week 40
Pregnancy Week 40 is usually the week of your estimated due date. Your baby is still growing, your body may be giving stronger signs that labor is close, and it is completely normal to still be waiting for labor to begin naturally.
Pregnancy Week 40 Overview
Pregnancy Week 40 is often the point when your estimated due date arrives. This does not mean labor must start on that exact day. Many healthy pregnancies continue a little before or a little after this date.
At this stage, your baby is full term and your body may show more obvious signs of preparing for labor. You may feel practice contractions, pelvic pressure, changes in discharge, lower back pain or simply a sense that things are slowly moving forward.
Fetal Development on Week 40
By Week 40, your baby is considered fully developed enough for birth and continues putting the final touches on body systems that have matured throughout the third trimester.
The baby may have a crown-to-rump length of around 14 inches and weigh about 7 and a half pounds, though healthy babies can be smaller or larger. Body fat helps keep the baby warm after birth, and the lungs, brain and nervous system have reached a stage where birth can happen at any time.
Your baby is full term and physically ready for birth, even though the exact day of labor is unpredictable.
The lungs are readying for life outside the womb as your baby prepares for the first breaths after delivery.
Important brain and nervous-system development continues into the very end of pregnancy.
Your baby may have less room, but regular movement should still continue in the usual pattern.
How Big Is the Baby at 40 Weeks?
At Pregnancy Week 40, your baby may measure around 14 inches crown-to-rump and weigh about 7.5 pounds.
These are average estimates only. Some babies are naturally smaller and some are naturally bigger, while still being perfectly healthy.
Your Due Date Arrives This Week
Week 40 is commonly known as due-date week. Many parents expect labor to begin exactly now, but that is not always how pregnancy works.
Some babies arrive before the due date, some on the due date, and many after it. Reaching 40 weeks without contractions does not automatically mean that something is wrong.
What matters most is how you and your baby are doing, whether movements remain normal, and whether your healthcare team has any concerns about the pregnancy continuing.
Maternal Changes on Week 40
Your body is now balancing late-pregnancy discomfort with the possibility that labor may begin at any time. It is common to feel heavy, tired, restless and impatient.
Pressure low in the pelvis may be stronger if the baby's head is sitting lower. Walking, changing position, sleeping and even simple daily tasks may feel more uncomfortable now than they did a few weeks earlier.
As the baby sits low in the pelvis, you may feel more downward pressure or heaviness.
Lower back discomfort is common, especially if contractions are beginning to build gradually.
Getting comfortable in bed can be difficult, and excitement or anxiety about labor can make sleep even harder.
Pressure on the bladder may cause frequent urination, especially when the baby's head has dropped lower.
Braxton Hicks vs Real Labor
Many people still have frequent Braxton Hicks contractions at Week 40. These are practice contractions and are often irregular. They may come and go without becoming stronger in a clear pattern.
Real labor contractions usually become more regular, more intense and closer together with time. They do not simply disappear after resting or changing position.
Possible Signs of Labor at Week 40
Labor can start suddenly or slowly. In some pregnancies it begins with clear contractions, while in others it begins with a bloody show, cramping, back pain or waters breaking.
Contractions begin to come in a more predictable pattern and usually grow stronger over time.
You may notice a sudden gush or a slow trickle of fluid from the vagina.
A pink, blood-tinged or mucus-like discharge can happen as the cervix begins changing.
A heavier feeling lower down may happen if the baby has dropped more deeply into the pelvis.
Your 40 Week Antenatal Appointment
If this is your first baby, you may have a 40-week antenatal appointment. Your midwife or doctor may check your blood pressure, ask for a urine sample, measure your bump and feel your abdomen to check the baby's position.
This appointment may also include a discussion about what happens if you remain pregnant after 40 weeks, how to monitor baby's movements and what to do if labor starts.
Baby Movement at 40 Weeks
Your baby's movements should continue. Because space is tighter, movements may feel more like rolls, pushes and stretches than big kicks, but your baby's usual activity pattern should still be there.
A noticeable drop in movement, no movement, or a major change from your normal pattern should not be ignored.
What If Labor Has Not Started Yet?
Many pregnancies continue a little beyond the estimated due date. If labor has not started by the end of Week 40, your healthcare team may begin talking with you about the next steps, including monitoring, membrane sweep or induction depending on your care setting and medical situation.
Being 40 weeks pregnant does not automatically mean you are overdue in a dangerous way. It simply means you have reached the estimated date based on pregnancy dating.
Self-Care Tips for Pregnancy Week 40
Rest Whenever You Can
Try to sleep, nap or relax whenever possible because labor can begin at any time and may take time and energy.
Eat Light, Nourishing Meals
Keep meals simple and balanced. Many people prefer smaller meals at this stage because the abdomen already feels full and heavy.
Drink Enough Fluids
Staying hydrated remains important, especially if contractions begin or the weather is warm.
Keep Moving Gently
Short walks, gentle stretching and comfortable upright positions may help you feel better unless your healthcare provider has advised otherwise.
Stay Calm and Prepared
Knowing your hospital route, having your phone charged and keeping your bag ready can make the waiting period feel more manageable.
When to Call Your Midwife or Doctor
Some symptoms need prompt medical advice, even if you are close to your due date and think labor may simply be starting.
A clear drop or major change in fetal movement needs urgent attention.
Heavy vaginal bleeding is different from a small bloody show and needs immediate medical help.
Call your healthcare team if you think your waters have broken, even if contractions have not started yet.
These can be concerning symptoms and should be assessed quickly.
Pregnancy Week 40 and Your Due Date Calculator
Pregnancy Week 40 is the point that most online due date calculations aim for. The date is estimated using the first day of the last menstrual period or other pregnancy dating details.
Our Pregnancy Due Date Calculator helps estimate this milestone, but real birth timing naturally varies from one pregnancy to another.
That means a due date is best understood as a target week, not a guaranteed delivery day.
Pregnancy Week 40 Timeline
Week 40 is usually the week when your estimated due date appears on your calendar.
Your baby is ready for birth, although the exact day labor begins can still vary.
Contractions, pelvic pressure, mucus changes or waters breaking may start becoming more noticeable.
If this is your first baby, your antenatal team may review your health, baby's position and your choices if pregnancy continues.
If labor has not started, the next stage usually includes a discussion about ongoing monitoring and possible next steps.
Useful Pregnancy Tools
Estimate your expected delivery date using basic pregnancy details.
Find out your current pregnancy week based on the most relevant dates.
Estimate when conception may have happened based on cycle timing.
Track how close you are to the estimated due date and major milestones.
Medical Guidance and Disclaimer
Pregnancy Week 40 information is helpful for general education, but it cannot tell you exactly when labor will start or whether your individual pregnancy is progressing normally.
Always follow the instructions given by your own midwife, obstetrician or healthcare team, especially if you have reduced baby movements, heavy bleeding, severe pain, a severe headache, vision changes or you think your waters have broken.
Pregnancy Week 40 FAQs
What happens during Pregnancy Week 40?
Pregnancy Week 40 is usually your due-date week. Labor may begin at any time, your baby is full term and your body may show more signs that birth is getting closer.
How big is the baby at 40 weeks?
A baby at 40 weeks may have a crown-to-rump length of around 14 inches and may weigh about 7.5 pounds, although healthy babies vary widely in size.
Is it normal not to be in labor at 40 weeks?
Yes. Your due date is only an estimate, and many healthy babies are born before or after that date.
Do Braxton Hicks continue at Week 40?
Yes. Practice contractions often continue at this stage and can become quite frequent even though they are not yet true labor.
What is the difference between Braxton Hicks and real labor?
Braxton Hicks are usually irregular and may ease with rest, while real labor contractions usually become stronger, more regular and closer together with time.
Will I have a 40 week antenatal appointment?
If this is your first baby, a 40-week antenatal appointment is commonly offered in NHS guidance.
Should baby movement continue at 40 weeks?
Yes. Movements may feel different because space is tight, but your baby's usual pattern should continue.
What if labor has not started after 40 weeks?
Your healthcare team may discuss what happens next, including monitoring, membrane sweep or induction depending on your pregnancy and local care plan.
Medical References and Further Reading
NHS:
Your Antenatal Care and Appointments
Mayo Clinic:
Fetal Development: The 3rd Trimester
Next: Pregnancy Week 41
In Week 41, your pregnancy continues beyond the estimated due date and your maternity team may discuss monitoring, membrane sweep, induction and the safest next steps for you and your baby.
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