How many months is 33 weeks pregnant?

33 weeks pregnant puts you in month 8 of pregnancy. Month 8 covers weeks 32 to 35. Providers count in weeks; months are approximate.

How big is the baby at 33 weeks?

At 33 weeks, the baby is about the size of a pineapple, roughly 43.7 cm long and around 1918 g. That is an average; healthy babies vary.

Which symptoms should I not ignore at 33 weeks pregnant?

Any bleeding now needs a call the same day. Bleeding from a placenta that lies low is often painless, and it can happen after sex. If bleeding comes with pain, whether steady or in waves, the placenta may be pulling away from the wall of the womb. Phone straight away, too, if the baby's movements slow down or change, or if fluid leaks from your vagina. Stinging when you pee can mean a urine infection, so report it. A bad headache, blurry sight, pain beneath the ribs, or a face, hands or feet that swell suddenly may point to pre-eclampsia.

Is it OK to deliver at 33 weeks?

A birth isn't planned this early unless there's a medical reason, but most babies born at 33 weeks do well. In a French national study, 98.6% of babies born alive at 32 to 34 weeks were still alive at age 2, and about 1 in 100 had cerebral palsy. Babies born now are called moderately preterm and often spend time in a neonatal unit. If birth looks likely within a week, steroid injections given to you before 34 weeks can help your baby's lungs get ready.

What position should my baby be in at 33 weeks?

The best position for birth is head down, facing your back, with the chin tucked in. Most babies settle into it by 36 weeks. Some still lie bottom first or sideways at 33 weeks, and there's time for them to turn. A heavy feeling low in the pelvis can be a clue that your baby's head is down. Your provider will feel for the position at later visits. Should your baby still be bottom first near 36 weeks, a doctor may try to turn them by pressing on your belly. This is called ECV, and it is usually offered.

Why do I have pelvic pressure or lightning crotch at 33 weeks?

As your baby gets heavier and moves lower, it can press on your cervix and the nerves around it. This can cause lightning crotch: a sudden, sharp or shooting pain in the vagina, bottom or pelvis that is gone within a minute. It's common in the third trimester and isn't a sign of labour by itself. Slow, careful movements and a support belt may help. Call your provider if pelvic pressure comes with regular tightenings, a low backache, bleeding or leaking fluid, since these can mean early labour.

How many days are left at 33 weeks pregnant?

At exactly 33 weeks, you have 7 weeks, or 49 days, until your due date at 40 weeks. That date is an estimate, and only 1 in 20 babies arrive on it. Doctors call a birth full term from 39 weeks up to the end of week 40. Babies born at 37 or 38 weeks are called early term, and those born before 37 weeks are preterm. Our how far along calculator counts the exact days left, based on when your last period started.

33 Weeks Pregnant

At 33 weeks pregnant, your baby is around 43.7 cm long from crown to heel. That's close to a pineapple in size. The NHS describes the brain and nervous system as fully developed by now, although the brain keeps growing until birth. Your womb may be getting ready too. Practice contractions, called Braxton Hicks, may start around now, and a heavy feeling low in your pelvis is common. That feeling can be a sign your baby has moved head down. This page explains how to tell practice tightenings from early labour, what your bump should measure, what happens if a baby arrives now, and which symptoms need a call.

What trimester is 33 weeks?

Week 33 is in the third trimester, which runs from week 28 until birth. A due date is set at 40 weeks, 7 weeks from now.

Week 33 — third trimester, month 8; 7 weeks to go until your due date.
Baby's size — about a pineapple, ~43.7 cm.

Not sure it's 33 weeks? Try our due date calculator.

How big is your baby at 33 weeks?

Size of a

pineapple

Length, head to heel

~43.7 cm

Weight

~1918 g

Up from a squash last week to a pineapple now.

Baby development at week 33

The fetus's immune system is developing as antibodies pass from you, offering protection that lasts into early infancy. The bones are hardening, though the skull stays soft and flexible to ease the journey through the birth canal. The pupils can now constrict and dilate in response to light. About the size of a pineapple.

Braxton Hicks or early labour at 33 weeks?

Braxton Hicks are practice tightenings of the womb. They can start as early as the second trimester, and many people notice them more in the third. Your bump goes hard for 20 to 30 seconds and then softens again. They may feel like mild period cramps or just tightness, and you can usually walk and talk through them.

These tightenings don't follow a pattern and don't build up. Walking, resting, a change of position, a glass of water or an empty bladder often makes them fade. Labour contractions behave differently. They arrive at regular times, last longer, get stronger and come closer together, and moving around doesn't stop them.

At 33 weeks, don't wait to see if tightenings settle down. Call your maternity unit or provider if they become painful or regular, or if you have six or more in an hour. Other signs of early labour include period-like cramps, an aching low back, a feeling of pressure in the pelvis, or a change in discharge, such as leaking fluid or blood. You can call any time you're unsure or worried.

Your body at 33 weeks

Aches in the pelvis and hips
Numbness or tingling (carpal tunnel)
Warmth and sweating from increased blood flow
Trouble sleeping

Your belly at 33 weeks

At 33 weeks, the usual range for your bump is 31 to 35 cm, measured upward from your pubic bone to the fundus (the highest point of the womb). Your provider checks this at routine visits, which in the US are often every 2 weeks at this stage. If the number is well outside that range, a scan can check the baby's growth.

Some bumps start to sit lower in late pregnancy as the baby moves down into the pelvis. In a first pregnancy, this tends to happen a few weeks before the birth. Along with a heavy, pressing feeling, you may notice backache, swollen hands and feet, and quick, sharp pains along the sides of your bump as the womb stretches.

Tips for week 33

Pelvic tilts and gentle stretches can ease hip aches
Stay cool and hydrated
Pack your hospital bag in the next week or two

33 Weeks Pregnant: your questions

What trimester is 33 weeks?: Week 33 is in the third trimester, which runs from week 28 until birth. A due date is set at 40 weeks, 7 weeks from now.
How many months is 33 weeks pregnant?: 33 weeks pregnant puts you in month 8 of pregnancy. Month 8 covers weeks 32 to 35. Providers count in weeks; months are approximate.
How big is the baby at 33 weeks?: At 33 weeks, the baby is about the size of a pineapple, roughly 43.7 cm long and around 1918 g. That is an average; healthy babies vary.
Which symptoms should I not ignore at 33 weeks pregnant?: Any bleeding now needs a call the same day. Bleeding from a placenta that lies low is often painless, and it can happen after sex. If bleeding comes with pain, whether steady or in waves, the placenta may be pulling away from the wall of the womb. Phone straight away, too, if the baby's movements slow down or change, or if fluid leaks from your vagina. Stinging when you pee can mean a urine infection, so report it. A bad headache, blurry sight, pain beneath the ribs, or a face, hands or feet that swell suddenly may point to pre-eclampsia.
Is it OK to deliver at 33 weeks?: A birth isn't planned this early unless there's a medical reason, but most babies born at 33 weeks do well. In a French national study, 98.6% of babies born alive at 32 to 34 weeks were still alive at age 2, and about 1 in 100 had cerebral palsy. Babies born now are called moderately preterm and often spend time in a neonatal unit. If birth looks likely within a week, steroid injections given to you before 34 weeks can help your baby's lungs get ready.
What position should my baby be in at 33 weeks?: The best position for birth is head down, facing your back, with the chin tucked in. Most babies settle into it by 36 weeks. Some still lie bottom first or sideways at 33 weeks, and there's time for them to turn. A heavy feeling low in the pelvis can be a clue that your baby's head is down. Your provider will feel for the position at later visits. Should your baby still be bottom first near 36 weeks, a doctor may try to turn them by pressing on your belly. This is called ECV, and it is usually offered.
Why do I have pelvic pressure or lightning crotch at 33 weeks?: As your baby gets heavier and moves lower, it can press on your cervix and the nerves around it. This can cause lightning crotch: a sudden, sharp or shooting pain in the vagina, bottom or pelvis that is gone within a minute. It's common in the third trimester and isn't a sign of labour by itself. Slow, careful movements and a support belt may help. Call your provider if pelvic pressure comes with regular tightenings, a low backache, bleeding or leaking fluid, since these can mean early labour.
How many days are left at 33 weeks pregnant?: At exactly 33 weeks, you have 7 weeks, or 49 days, until your due date at 40 weeks. That date is an estimate, and only 1 in 20 babies arrive on it. Doctors call a birth full term from 39 weeks up to the end of week 40. Babies born at 37 or 38 weeks are called early term, and those born before 37 weeks are preterm. Our how far along calculator counts the exact days left, based on when your last period started.

Useful at week 33

How far along am I? — your exact weeks, days and days left
Fetal viability — why each extra week in the womb helps
Pregnancy discharge by trimester — how to tell normal discharge from leaking fluid
Massage in pregnancy — an option for pelvic and back aches
Pregnancy weeks to months — 33 weeks is in month 8 — see every week

← 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.