Week 31: Running out of room
You’re 31 weeks pregnant — about 9 weeks to go. Your baby is roughly the size of a coconut.
Size of
a coconut
Length
41.1 cm
16.2 in · head to heel
Weight
1.50 kg
53.0 oz
Your baby this week
Your baby can turn their head from side to side and is putting on weight quickly. All five senses are now working, and they process information from their environment.
Your body & how you might feel
Your breasts may begin leaking colostrum — the nutrient-rich first milk. Braxton Hicks contractions may become more noticeable.
Common symptoms at week 31
- Leaking colostrum
- Braxton Hicks
- Backache
- Trouble sleeping
This week’s tip: A little leaking is normal — breast pads keep you comfortable. Severe or painful contractions, though, warrant a call.
A gentle reminder: This is an estimate, not medical advice. Dates and figures are general guidance — every pregnancy is different. Your healthcare provider’s assessment, especially from an early ultrasound, always takes priority. Always speak with your provider about your pregnancy.
Week 31 FAQs
How big is the baby at 31 weeks?
At 31 weeks pregnant, your baby is roughly the size of a coconut, about 41.1 cm (16.2 in) long and around 1.50 kg. These are typical averages — every baby grows at its own pace.
How many months is 31 weeks pregnant?
31 weeks pregnant is about 7 months, in the third trimester, with about 9 weeks to go until your due date.
What are common symptoms at 31 weeks?
Common experiences around week 31 include leaking colostrum, braxton hicks, backache, trouble sleeping. Symptoms vary widely — contact your provider if anything worries you.