Week 13 of pregnancy
13 Weeks Pregnant
Second trimester
Baby size
About the size of a lemon
7.4 cm
What's developing
You're at the end of the first trimester. Vocal cords are forming and the intestines have moved into the abdomen.
Common symptoms this week
- More energy
- Fewer bathroom trips
- Visible veins
- Higher libido for some
This is an estimate for information only — only about 1 in 20 babies arrive on their due date. Always confirm dates with your midwife or doctor.
How big is a baby at 13 weeks?
Baby growth chart
Typical fetal length and weight from week 8 to week 40.
Length
cmWeek 13: 7.4 cm
Weight
gramsWeek 13: 23 g
Typical averages based on Hadlock / ACOG references. Weeks 8–20 use crown–rump length; weeks 21–40 switch to crown–heel — that's the small jump you'll see mid-chart. Real babies vary — your ultrasound is the reliable number for you.55
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