🤰 Pregnancy week by week

16 Weeks Pregnant: Baby Size, Development & Symptoms

Your baby is about the size of an avocado.

By Cushies Editorial Team · 2 min read · Updated 17 August 2026

Baby's size	About the size of an avocado
Length	about 11.6 cm
Weight	about 100 g
Trimester	Second trimester, month 4

Your baby this week

The baby’s heart pumps about 25 litres of blood a day. Facial muscles are working.

Your body this week

Some people feel the first flutters of movement from around now.

Tip of the week

Start sleeping on your side as your bump grows.

Quick answers

How big is my baby at 16 weeks?

About the size of an avocado: around 11.6 cm long and around 100 g.

How many months is 16 weeks pregnant?

16 weeks is in month 4 of pregnancy, in the second trimester.

This article is general information, not medical advice. If you are worried about your health or your baby's, please talk to your doctor.

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