Second trimester · Week 16 of 40
16 weeks pregnant: the size of a avocado
Eyes can move slowly, and the heart pumps about 25 litres of blood a day.
Reviewed against ACOG, NHS and WHO guidance · Updated November 2026
Typical size
About 11.6 cm · 100 g
40% of the way to your due date
Your baby this week
Eyes can move slowly, and the heart pumps about 25 litres of blood a day.
Your body this week
Some women feel the first flutters (quickening) between weeks 16 and 22.
Tip for week 16
Start sleeping on your side as your bump grows.
Carry this guide in your pocket
Mamivaa is a free pregnancy app with a week-by-week tracker, vitamin and water reminders, a food scanner and a baby checklist.
Start freeThis guide offers general information and does not replace advice from your doctor or midwife. If something feels wrong, contact your provider or emergency services.