31 weeks pregnant
At 31 weeks you are in month 7 and the third trimester. Your baby is about the size of a pineapple: 41.1 cm and 1.7 kg.
As big as
pineapple
Length
41.1 cm
Weight
1.7 kg
Month
7
Trimester
third trimester
To go
63 days
Averages. Measured crown to rump up to week 20, crown to heel after that. Healthy babies vary a lot.
Your baby this week
All five senses are now joining in.
Your body
Needing to pee often returns as the baby presses lower on your bladder.
Good to know
The baby practises breathing by moving fluid in and out.
To sort around these weeks
- Agree your leave start date with your employer.
- Write a birth plan and go through it with your midwife.
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Frequently asked questions
How many months is 31 weeks pregnant?
31 weeks pregnant falls in month 7 of your pregnancy.
Which trimester is 31 weeks?
At 31 weeks you are in the third trimester.
How big is a baby at 31 weeks?
On average 41.1 cm, about the size of a pineapple. Healthy babies vary a lot.
How long to go at 31 weeks?
Until your due date (40 weeks): 9 weeks, 63 days.
All weeks
General information, not medical advice. If in doubt, call your midwife or GP. Sources: WHO fetal growth charts (Kiserud et al., PLoS Med 2017); Robinson and Fleming 1975; NHS, Your pregnancy and baby guide.