Week by week / Second trimester
Week 16
Your baby is about the size of an avocado. Here is what is happening, what you might feel, and the two or three things worth doing this week.
Size right now
An avocado
11.6 cm / 4.6 in, 100 g / 4 oz
- Length
- 11.6 cm / 4.6 in
- Weight
- 100 g / 4 oz
- Trimester
- Second
- To go
- 24 weeks
The baby
The heart pumps around 25 litres of blood a day. The baby can hear muffled sound from outside now.
You
Some second time mothers feel the first movements this week. First timers usually wait a few more weeks.
This week
Cervical length is checked from 16 weeks if you have risk factors
Anatomy scan gets booked around now, ask when you call
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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.