Week 16 of pregnancy
16 Weeks Pregnant
Second trimester
Baby size
About the size of a avocado
11.6 cm
What's developing
Tiny facial muscles are working and the eyes can move. Some people begin to feel very early flutters.
Common symptoms this week
- Backache
- Faint flutters
- Weight gain
- Stretchy skin
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 16 weeks?
Baby growth chart
Typical fetal length and weight from week 8 to week 40.
Length
cmWeek 16: 11.6 cm
Weight
gramsWeek 16: 100 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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