Week by week / Second trimester
Week 21
Your baby is about the size of a carrot. Here is what is happening, what you might feel, and the two or three things worth doing this week.
Size right now
A carrot
26.7 cm / 10.5 in, 360 g / 13 oz
- Length
- 26.7 cm / 10.5 in
- Weight
- 360 g / 13 oz
- Trimester
- Second
- To go
- 19 weeks
The baby
Regular sleep and wake cycles begin, and they will not match yours. Bone marrow starts making blood cells.
You
Movements get stronger and more regular. You may start noticing when the baby is usually awake.
This week
Book childbirth classes for weeks 28 to 34
Check whether your workplace needs notice of leave, many need it by week 25
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Averages, not targets. Babies vary a great deal and a scan that reads differently from this page is not a problem. Anything that worries you is a call to your midwife or doctor, not a search.