Week 21 of pregnancy
21 Weeks Pregnant
Second trimester
Baby size
About the size of a carrot
26.7 cm
What's developing
The baby's movements are becoming more coordinated. Taste buds are developing on the tongue.
Common symptoms this week
- Braxton Hicks may start
- Stretch marks
- Warmer skin
- Backache
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 21 weeks?
Baby growth chart
Typical fetal length and weight from week 8 to week 40.
Length
cmWeek 21: 26.7 cm
Weight
gramsWeek 21: 360 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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