Third trimester · Week 31 of 40
31 weeks pregnant: the size of a coconut
All five senses are working.
Reviewed against ACOG, NHS and WHO guidance · Updated November 2026
Typical size
About 41 cm · 1.5 kg
78% of the way to your due date
Your baby this week
All five senses are working.
Your body this week
You may leak a little colostrum from your breasts.
Tip for week 31
Take a birth or breastfeeding class if available.
Carry this guide in your pocket
Mamivaa is a free pregnancy app with a week-by-week tracker, vitamin and water reminders, a food scanner and a baby checklist.
Start freeThis guide offers general information and does not replace advice from your doctor or midwife. If something feels wrong, contact your provider or emergency services.