34 weeks pregnant

How big is your baby at 34 weeks?

About the size of a cantaloupe melon — the NHS puts your baby at around 45 cm (17.7 in) from head to heel, curled up with the legs bent towards the chest because there is no longer room to do anything else.

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). There is not a lot of space in there now, but you should still feel your baby shifting around, and see your bump change shape when they do.

What's developing this week

Most of the structural work is finished and this is a fattening-up and finishing stage. If you are carrying a boy, the testicles are descending from the abdomen into the scrotum around now. The NHS flags something worth knowing in advance, because it alarms a lot of new parents: newborn genitals can look quite enlarged at birth. That is swelling from extra fluid or a late rush of hormones, and it settles within a few days.

Your baby's routine is now established enough to recognise — the busy stretches, the quiet ones, the particular roll or jab that is theirs. That familiarity is not sentimental; it is the clinical tool this week hands you.

What you might feel

The headline symptom of week 34 is symptoms disappearing. The NHS describes it: when your baby moves head down into the pelvis in a staged process called engagement, the drop is known as "lightening". It frees up space in your abdomen, gives your lungs a break so breathlessness eases, and takes pressure off your stomach so heartburn can vanish. It also means you need to pee more, and walking becomes more of a struggle.

Lightening is not a countdown. The NHS says so directly — it does not mean you are about to give birth, and you will probably wait several more weeks.

Your breasts may feel huge and may be leaking yellowish colostrum, the early milk rich in antibodies. The NHS also asks you to sleep on your side from now on: the evidence shows it is better for the baby, because it helps blood flow to the placenta.

Alongside that: Braxton Hicks tightenings, broken sleep, backache, indigestion, leg cramps, swollen hands and feet, dizziness and piles.

Movements do not slow down at the end

This is the week to read this section properly, because from here on it is the most important thing on the page. 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 34 weeks pregnant 8 months or 9 months?

Week 34 is in month 8, its third week. Two full months of pregnancy left in the counting that matters, which is weeks.

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 34-week appointment this week. On the NHS schedule your midwife will check your blood pressure, test your urine, measure your bump, discuss your baby's movements, ask about your mental health, and start talking properly about preparing for birth, your preferences, and how you will know when you are in labour. That last conversation is worth arriving with questions for.

Two vaccines are still available if you have missed them. The RSV vaccine, usually offered around week 28, can be given right up until you go into labour and lowers your baby's risk of bronchiolitis. The whooping cough vaccine is usually offered between 16 and 32 weeks, and the NHS says it is not too late now.

The earliest you can usually start maternity leave is 11 weeks before the expected week of birth, and it starts automatically the day after the birth if your baby comes early. On travel, the RCOG notes most airlines do not carry you after 37 weeks, so this is the last comfortable window.

If labour started this week

At 34 weeks a birth would be premature, and the NHS says about 8 out of 100 babies are born before 37 weeks. Call your midwife or maternity unit if you are under 37 weeks and have regular tightenings, period-type pains, a gush or trickle of fluid, or unusual backache.

What would happen: checks for whether your waters have broken, whether you are in labour and whether there is an infection — usually an examination, blood and urine tests, and cardiotocography. You may be offered steroid injections to help your baby's lungs. If your waters break between 34 and 37 weeks you will be offered a choice between induction and expectant management, and immediate induction or a caesarean if group B strep has been found.

Our contraction timer measures start to start and treats a pattern before 37 weeks as a reason to ring, not a reason to keep timing.

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.