31 Weeks Pregnant
Summary
Size
coconut
Length
41.1 cm
Weight
1502 g
Until due date
9 weeks
31 / 40 week
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What's Happening With Your Baby
All five of the baby's senses are working. The immune system is developing and antibodies are passing to the baby from you. Weight gain has reached roughly 200 g a week.
What's Changing For You
Breathlessness is becoming pronounced. Braxton Hicks contractions may feel stronger. Pressure in the pelvis is increasing.
To Do This Week
Learn the difference between real labour and Braxton Hicks: real contractions come regularly, intensify, and don't stop when you change position.
Put your birth plan in writing and share it with your doctor.
Switch to small, frequent meals — there's no room left for your stomach.
Frequently Asked Questions
How many months is 31 weeks pregnant?
Week 31 of pregnancy falls in month 7 and in the third trimester. Pregnancy months don't run in neat four-week blocks, so the week-to-month conversion rarely lands on a whole number — which is why pregnancy is tracked in weeks.
How big is the baby at 31 weeks?
At 31 weeks your baby is roughly the size of a coconut: around 41.1 cm long and 1502 grams. These are averages; clear variation between babies is normal, and what matters is the growth curve your doctor is tracking.
How long is left at 31 weeks pregnant?
Assuming a 40-week pregnancy, you have around 9 weeks left at week 31. Most births happen between weeks 37 and 42, so a due date is a range rather than a fixed day.
What should I watch out for at 31 weeks?
Learn the difference between real labour and Braxton Hicks: real contractions come regularly, intensify, and don't stop when you change position. Put your birth plan in writing and share it with your doctor. Switch to small, frequent meals — there's no room left for your stomach.
Track your pregnancy week by week
Baby Wallie brings your baby's weekly development, your health logs and AI-powered nutrition, sleep and breathing programs into one app. Free for 7 days.
Related Guides
When To Seek Care Immediately
Whatever week you are in, contact your doctor or the nearest health facility without waiting if you have: vaginal bleeding or fluid loss, severe persistent abdominal pain, a severe headache, blurred vision or flashing lights, sudden swelling of the hands or face, a fever above 38 °C, burning on urination with fever, persistent vomiting, fainting, or — after week 28 — a clear reduction in your baby's movements. In these situations reach real medical care rather than an app or a web search.
This content is for informational purposes only and does not replace medical advice. Always consult your doctor or midwife about your own or your baby's health.