33 Weeks Pregnant
Reviewed by Safi Allah Khan
Medically reviewed by: Safi Allah Khan · Written by the Momi team · Last updated 20 October 2026
Quick answer: At 33 weeks pregnant, your baby is about the size of a pineapple, about 43.7 cm (17.2 in) long. You're in the third trimester, in month 8, with 7 weeks to go until your due date. This week's milestone: skull stays soft. Symptoms vary from person to person.
| Week 33 at a glance | |
|---|---|
| Trimester | Third |
| Month | 8 |
| Weeks to due date | 7 |
| Baby's size | About the size of a pineapple |
| Length | About 43.7 cm (17.2 in) |
| Weight | About 1.9 kg (4.2 lb) |
| This week | Skull stays soft |
Sizes are typical averages. Before about 20 weeks, length is measured crown to rump; after that, head to heel.
Your baby at 33 weeks
Your baby is about the size of a pineapple and weighs about 1.9 kg (4.2 lb). The bones are hardening, but the skull bones stay soft and separate to help with birth.
Your body at 33 weeks pregnant
Sleep may be broken by needing to pee, heartburn or leg cramps. Pelvic pressure can increase.
Things to do this week
- Try a pillow between your knees for side sleeping.
- Plan who will look after other children or pets during labor.
- Review your options for pain relief.
When to call your doctor or midwife
Contact your care team straight away if:
- your baby is moving less than usual, has stopped moving, or the pattern has changed. The NHS says to call immediately, even in the middle of the night
- you have a severe headache, vision changes, pain below your ribs or sudden swelling (possible pre-eclampsia)
- you have intense itching, especially on the palms of your hands or soles of your feet
- you have contractions, your waters break or you bleed before 37 weeks
- you have a fever of 100.4°F (38°C) or higher
If something feels wrong, trust that feeling and call. In an emergency, call your local emergency number.
Track week 33 in Momi
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Keep reading
← 32 weeks pregnant · All weeks · 34 weeks pregnant →
Sources
- ACOG: Changes During Pregnancy (infographic)
- NHS: Your baby's movements
- NHS: Antenatal care and appointments
- CDC: Urgent Maternal Warning Signs
Medical disclaimer: Momi and this website provide general information, not medical advice. Always talk to your doctor or midwife; in an emergency call your local emergency number.
FAQ
How big is a baby at 33 weeks pregnant?
On average, a baby at 33 weeks is about the size of a pineapple: about 43.7 cm (17.2 in), about 1.9 kg (4.2 lb). These are typical averages, and healthy babies vary.
How many months is 33 weeks pregnant?
33 weeks pregnant is in the eighth month of pregnancy and the third trimester. Months don't divide evenly into 40 weeks, so different sources may label the month slightly differently.
What should I do at 33 weeks pregnant?
Try a pillow between your knees for side sleeping. Plan who will look after other children or pets during labor.
Related guides
Track this in Momi
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