39 weeks pregnant
At 39 weeks you are in month 9 and the third trimester. Your baby is about the size of a watermelon: 50.7 cm and 3.4 kg.
As big as
watermelon
Length
50.7 cm
Weight
3.4 kg
Month
9
Trimester
third trimester
To go
7 days
Averages. Measured crown to rump up to week 20, crown to heel after that. Healthy babies vary a lot.
Your baby this week
Full term! The baby is waiting for the starting signal.
Your body
Rest where you can; your body knows what it's doing.
Good to know
Only a small share of babies are born exactly on the due date.
To sort around these weeks
- You are close to or at your due date: rest where you can.
- After 41 weeks your midwife talks you through the next steps.
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Frequently asked questions
How many months is 39 weeks pregnant?
39 weeks pregnant falls in month 9 of your pregnancy.
Which trimester is 39 weeks?
At 39 weeks you are in the third trimester.
How big is a baby at 39 weeks?
On average 50.7 cm, about the size of a watermelon. Healthy babies vary a lot.
How long to go at 39 weeks?
Until your due date (40 weeks): 1 weeks, 7 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.