36 weeks pregnant

How big is your baby at 36 weeks?

About the size of a romaine lettuce — around 47.4 cm (18.7 in) head to heel. The NHS marks this week with the sentence most people are waiting for: your baby's lungs are probably now mature enough to breathe outside the womb without help.

A note on the numbers: these are head-to-heel lengths. The NHS gives one for every week of the third trimester but no weekly weight — the only weight it publishes in this range is at 41 weeks, where the average baby is around 3 to 4 kg (6 lb 10 oz to 8 lb 13 oz). Your baby can also suck and digest breast milk by now.

What's developing this week

Lung maturity is the milestone, and it is why steroid injections to help a baby's breathing may not be offered after 36 weeks: the NHS notes the lungs are likely ready on their own by then. Position matters from this week too. Your baby may already have moved head down into your pelvis, which means they are "engaged" and in position for labour — though the NHS is careful to add that this does not mean labour is on the way. It could still be weeks.

What you might feel

A little wee escaping when you laugh or cough is the new arrival this week. The NHS explains it as your body preparing for birth by relaxing the pelvic floor muscles around the bladder. Maternity pads help, and it is worth stocking up anyway because you will want them afterwards. Pelvic floor exercises are genuinely worth doing now — tighten as though you were stopping yourself mid-wee, hold, release.

Otherwise: Braxton Hicks, backache, indigestion, broken sleep, swollen hands and feet, leg cramps, piles, breathlessness if your baby has not dropped, and a body that has run out of enthusiasm for stairs.

Movements do not slow down at the end

Engagement changes where you feel movements, lower and more towards your bladder. It does not reduce how many you feel. Call your midwife or maternity unit immediately if your baby is moving less than usual, if you cannot feel them moving, or if their usual pattern has changed — do not wait until the next day, do not wait for your next appointment, and call even in the middle of the night. Those are the NHS's own words, and maternity triage is staffed 24 hours a day for exactly this call.

Babies do not move less at the end because they have run out of room. The RCOG says movements tend to increase until about 32 weeks then stay roughly the same, and that you should feel your baby move right up to and during labour. Nor do you need to count: the NHS says "you do not need to count the number of kicks or movements you feel each day", and RCOG Green-top Guideline No. 57, second edition, reviewed 29 April 2026, found insufficient evidence to recommend counting using specified numbers. What matters is a change from your baby's own pattern.

Tommy's reports that 55% of women who had a stillbirth had noticed their baby's movements slow down or stop and had not reported it. Our movements counter records what normal looks like for your baby, but no number on it means everything is fine — and a home Doppler is worse: the NHS says hearing a heartbeat does not mean your baby is well.

Is 36 weeks pregnant 8 months or 9 months?

Week 36 is the first week of month 9 on the mapping almost everyone uses. You are in the last month, whatever your due date says.

There is no official weeks-to-months map, and a calendar month averages 4.3 weeks rather than 4, so 40 weeks is a little over nine months. The usual mapping:

• Month 1 — weeks 1 to 4
• Month 2 — weeks 5 to 8
• Month 3 — weeks 9 to 13
• Month 4 — weeks 14 to 17
• Month 5 — weeks 18 to 22
• Month 6 — weeks 23 to 27
• Month 7 — weeks 28 to 31
• Month 8 — weeks 32 to 35
• Month 9 — weeks 36 to 40

Your maternity team counts in weeks and days. Our weeks to months converter shows both mappings.

What's happening at your appointments around now

You have a 36-week appointment. The distinguishing feature is that your midwife will feel your bump to check your baby's position — head down, breech or lying sideways — as well as measuring your bump, checking your blood pressure, testing your urine, discussing movements and your mental health, and going through your birth preferences.

The NHS puts it bluntly on its week 36 page: you may not feel like going, but make these a priority. "These appointments save lives as they can pick up on changes in your body that you might not be aware of, such as very high blood pressure."

This is also the last week most airlines will carry you. The RCOG notes that most do not allow flying after 37 weeks, that insurance gets harder after that, and that over 28 weeks your airline may ask for a letter from your midwife confirming your due date.

If your baby is breech at 36 weeks

Breech is very common earlier in pregnancy and most babies turn by 36 to 37 weeks. The RCOG says only 3 to 4 in every 100 babies are breech towards the end, and that a baby staying breech does not usually mean anything is wrong. Three options get discussed at 36 weeks: turning the baby by external cephalic version (ECV), a planned caesarean, or a planned vaginal breech birth.

ECV is firm pressure on your abdomen to encourage the baby round, usually done after 36 or 37 weeks and possible right up to early labour. The NHS says it works around half the time. Medication to relax the uterus is injected first, which improves the odds. There is a scan before and after and your baby's heart rate is monitored. It can be uncomfortable and occasionally painful, and the person doing it should stop if you are in pain. If you are rhesus D negative you will be advised to have anti-D afterwards. Contact the hospital if you have bleeding, abdominal pain, contractions or reduced movements after an ECV.

How babies actually arrive, and packing for it

The NHS puts numbers on the ways babies are born in England: around 6 in 10 births are vaginal, nearly 3 in 10 are by caesarean, and just over 1 in 10 are assisted with ventouse or forceps. Worth knowing before you write a birth plan that assumes one outcome.

This is the week the NHS asks you to have your bag packed, with your hospital reference number and phone numbers written down. Our hospital bag checklist builds a list around your actual plans, and the birth plan generator covers the choices in the order you will be asked about them.

When to call your midwife or doctor

These do not wait until morning.

Emergency now: 999 in the UK and Ireland, 911 in the US and Canada, 000 in Australia, 111 in New Zealand

• You think your baby is coming now and you have a strong urge to push
• You have a seizure, or you collapse

Call your midwife or maternity unit immediately, whatever the hour

• Your baby is moving less than usual, or the pattern has changed
• Your waters break — and again if the fluid is smelly, green or bloodstained
• Any vaginal bleeding
• You are less than 37 weeks pregnant and think you might be in labour — regular tightenings, period-type pains, a gush or trickle of fluid, or unusual backache
• Any contraction lasting longer than 2 minutes, or 6 or more contractions in every 10 minutes
• A severe headache painkillers do not shift, blurred vision or flashing lights, pain just below the ribs, sudden swelling of your face, hands or feet, vomiting or feeling very unwell — the NHS pre-eclampsia symptoms
• Severe itching at night, a temperature above 37.5C with no cold or flu symptoms, or persistent stomach pain
• You feel that something is wrong, without being able to say what

You do not need to be sure — units would rather see you twice than too late.