13 weeks pregnant
At 13 weeks you are in month 3 and the first trimester. Your baby is about the size of a pea pod: 7 cm and 40 g.
As big as
pea pod
Length
7 cm
Weight
40 g
Month
3
Trimester
first trimester
To go
189 days
Averages. Measured crown to rump up to week 20, crown to heel after that. Healthy babies vary a lot.
Your baby this week
Fingerprints are forming. Already one of a kind.
Your body
The second trimester begins; many women get more energy.
Good to know
The baby can swallow and practises with amniotic fluid.
To sort around these weeks
- Your booking appointment and usually a dating scan, which fixes your due date.
- Decide when you tell people, and when you tell your employer.
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Frequently asked questions
How many months is 13 weeks pregnant?
13 weeks pregnant falls in month 3 of your pregnancy.
Which trimester is 13 weeks?
At 13 weeks you are in the first trimester.
How big is a baby at 13 weeks?
On average 7 cm, about the size of a pea pod. Healthy babies vary a lot.
How long to go at 13 weeks?
Until your due date (40 weeks): 27 weeks, 189 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.