How many months is 36 weeks pregnant?

36 weeks pregnant puts you in month 9 of pregnancy. Week 36 is the first week of that month, which runs to week 40. Providers count in weeks; months are approximate.

How big is the baby at 36 weeks?

At 36 weeks, the baby is about the size of a romaine lettuce, roughly 47.4 cm long and around 2622 g. That is an average; healthy babies vary.

What symptoms should you not ignore at 36 weeks pregnant?

At 36 weeks, labour would still be early. Phone your maternity unit or provider now if you get regular tightenings, period-type pains, a gush or trickle of fluid, bleeding, or a backache that isn't usual for you. Call at once, day or night, if your baby moves less. Pre-eclampsia can show up as a severe headache, blurry vision, pain under the ribs, or your face, hands or feet suddenly puffing up, so get these checked straight away. Itchy palms or soles that are worse at night need a prompt check too, as they can signal a liver problem.

Why does my pelvis hurt so much at 36 weeks pregnant?

Pain at the front of the pelvis that makes walking hard is often pelvic girdle pain (PGP), also called SPD. It affects up to 1 in 5 pregnant women to some degree. It tends to be worse on stairs, when standing on one leg, turning over in bed or getting out of a car. It isn't harmful to your baby. Ask your midwife or doctor about a physio referral or a support belt. Keep your knees together getting in and out of the car, sit down to dress, and sleep with a pillow between your legs.

What should I avoid at 36 weeks pregnant?

Long trips are harder and riskier now, as labour could start. In the US, most airlines let you fly within the country until about 36 weeks, and cut-offs for international flights are often earlier, so check first. Long car journeys are best avoided too. Keep going to sleep on your side, not your back. Stay away from alcohol and smoking. Skip home heartbeat monitors (Dopplers), because hearing a heartbeat doesn't prove your baby is well. If movements slow down or change, call your provider or maternity unit at once.

Is diarrhoea at 36 weeks pregnant normal?

It can be. The most common causes of diarrhoea are a stomach bug or food poisoning. But loose stools can also be an early hint of labour, and at 36 weeks labour would be preterm. So call your provider now if the diarrhoea comes with cramps that feel like gas pains, tightenings, pressure in your pelvis, a low backache or leaking fluid. Otherwise, sip fluids often. Ask a pharmacist before taking anything for it, as some stomach medicines aren't suitable in pregnancy.

Is it safe to have a baby at 36 weeks?

A baby born at 36 weeks is called late preterm, a group that runs from 34 weeks 0 days to 36 weeks 6 days. By now the lungs are probably mature enough to breathe without help, and these babies may not look premature. Still, they are less mature than babies born at term. They have a higher risk of problems such as trouble feeding, keeping warm, low blood sugar and jaundice, and some may need extra care before going home. That's why, without a medical reason, planned births wait until at least 39 weeks.

36 Weeks Pregnant

At 36 weeks pregnant, your baby is around 47.4 cm from head to heel, about the size of a head of romaine lettuce. The lungs are probably mature enough to breathe without help now, and your baby can suck and digest milk. In one more week, a birth will no longer count as preterm. Many people feel heavy, achy and short of breath at this stage. This page covers what your 36-week checkup looks at, including your baby's position and the group B strep swab. It also explains why your bump may soon measure smaller, why your pelvis may hurt, what to avoid now and which symptoms need a call.

What trimester is 36 weeks?

Week 36 is in the third trimester, which runs from week 28 until birth. A due date is set at 40 weeks, 4 weeks from now.

Week 36 — third trimester, month 9; 4 weeks to go until your due date.
Baby's size — about a romaine lettuce, ~47.4 cm.

Not sure it's 36 weeks? Try our due date calculator.

How big is your baby at 36 weeks?

Size of a

romaine lettuce

Length, head to heel

~47.4 cm

Weight

~2622 g

Up from a honeydew melon last week to a romaine lettuce now.

Baby development at week 36

The fetus is shedding most of the downy lanugo hair and the waxy vernix, swallowing both along with amniotic fluid — this forms the first bowel movement (meconium). The skull bones remain unfused and slightly movable to ease delivery. Most babies are head-down by now. About the size of a head of romaine.

What happens at your 36-week appointment

At this checkup, your midwife or doctor will usually check your blood pressure, measure your bump and feel your belly to work out which way your baby is lying. If the position isn't clear, an ultrasound or an internal exam can confirm it. Most babies are head-down by now. A breech baby, lying bottom or feet first, is found in about 3 to 4 in 100 full-term births.

If your baby is breech at 36 weeks, you will usually be offered an external cephalic version (ECV). A doctor presses on your belly to turn the baby head-down, and the baby's heart rate is checked before and after. It works about half the time and can feel a bit uncomfortable. ECV isn't tried with twins or with some placenta problems. If your baby stays breech, you will talk through the options, which is most often a planned caesarean.

In the US, this is also when you are tested for group B strep, a common germ that about 1 in 4 pregnant women carry, usually without knowing it. ACOG advises a swab of the vagina and rectum between 36 and 37 weeks 6 days. If it is positive, you get antibiotics through a drip in labour, because without them 1 or 2 in 100 babies of carriers get sick. The NHS doesn't test for it routinely. In most of the US, the RSV vaccine is also advised at 32 to 36 weeks from September to January. Your baby can get an RSV antibody shot after birth instead.

Your body at 36 weeks

Lightening — the baby drops lower, easing breathing but increasing pelvic pressure
Frequent urination
Pelvic aches and 'lightning crotch' jolts
Strong nesting urge for some

Your belly at 36 weeks

Your bump is at its highest around now. At about 36 weeks, the top of your uterus reaches your breastbone. Up to this point, the distance from your pubic bone to the top of your bump in centimetres roughly matches your weeks, give or take 2 cm, so about 34 to 38 cm now. With the uterus pressing up this high, feeling short of breath and getting heartburn are common.

From here, your bump may measure a little smaller as your baby moves down into your pelvis to get ready for birth. If it does, your provider may check that there is no other reason for the change. Leaking a little pee when you laugh or cough is common too, as the pelvic floor muscles around the bladder relax. Pads and daily pelvic floor exercises can help.

Tips for week 36

Weekly prenatal visits typically begin around now
Learn the signs of labour and when to call your provider
Install and check the car seat

36 Weeks Pregnant: your questions

What trimester is 36 weeks?: Week 36 is in the third trimester, which runs from week 28 until birth. A due date is set at 40 weeks, 4 weeks from now.
How many months is 36 weeks pregnant?: 36 weeks pregnant puts you in month 9 of pregnancy. Week 36 is the first week of that month, which runs to week 40. Providers count in weeks; months are approximate.
How big is the baby at 36 weeks?: At 36 weeks, the baby is about the size of a romaine lettuce, roughly 47.4 cm long and around 2622 g. That is an average; healthy babies vary.
What symptoms should you not ignore at 36 weeks pregnant?: At 36 weeks, labour would still be early. Phone your maternity unit or provider now if you get regular tightenings, period-type pains, a gush or trickle of fluid, bleeding, or a backache that isn't usual for you. Call at once, day or night, if your baby moves less. Pre-eclampsia can show up as a severe headache, blurry vision, pain under the ribs, or your face, hands or feet suddenly puffing up, so get these checked straight away. Itchy palms or soles that are worse at night need a prompt check too, as they can signal a liver problem.
Why does my pelvis hurt so much at 36 weeks pregnant?: Pain at the front of the pelvis that makes walking hard is often pelvic girdle pain (PGP), also called SPD. It affects up to 1 in 5 pregnant women to some degree. It tends to be worse on stairs, when standing on one leg, turning over in bed or getting out of a car. It isn't harmful to your baby. Ask your midwife or doctor about a physio referral or a support belt. Keep your knees together getting in and out of the car, sit down to dress, and sleep with a pillow between your legs.
What should I avoid at 36 weeks pregnant?: Long trips are harder and riskier now, as labour could start. In the US, most airlines let you fly within the country until about 36 weeks, and cut-offs for international flights are often earlier, so check first. Long car journeys are best avoided too. Keep going to sleep on your side, not your back. Stay away from alcohol and smoking. Skip home heartbeat monitors (Dopplers), because hearing a heartbeat doesn't prove your baby is well. If movements slow down or change, call your provider or maternity unit at once.
Is diarrhoea at 36 weeks pregnant normal?: It can be. The most common causes of diarrhoea are a stomach bug or food poisoning. But loose stools can also be an early hint of labour, and at 36 weeks labour would be preterm. So call your provider now if the diarrhoea comes with cramps that feel like gas pains, tightenings, pressure in your pelvis, a low backache or leaking fluid. Otherwise, sip fluids often. Ask a pharmacist before taking anything for it, as some stomach medicines aren't suitable in pregnancy.
Is it safe to have a baby at 36 weeks?: A baby born at 36 weeks is called late preterm, a group that runs from 34 weeks 0 days to 36 weeks 6 days. By now the lungs are probably mature enough to breathe without help, and these babies may not look premature. Still, they are less mature than babies born at term. They have a higher risk of problems such as trouble feeding, keeping warm, low blood sugar and jaundice, and some may need extra care before going home. That's why, without a medical reason, planned births wait until at least 39 weeks.

Useful at week 36

Flying in pregnancy — airline cut-offs around 36 weeks and what to check first
Is Pepto-Bismol safe in pregnancy? — why it's best avoided for an upset stomach
Pregnancy due date calculator — count the days left to 40 weeks
Pregnancy weight gain calculator — see where your total gain has landed
Pregnancy weeks to months — 36 weeks is the start of month 9

← All weeks: the full pregnancy week-by-week guide

Sources

Checked against the following public guidance on October 2, 2026. Advice can differ between countries; your doctor, nurse or midwife can apply it to you.