🤰 Pregnancy week by week

17 Weeks Pregnant: Baby Size, Development & Symptoms

Your baby is about the size of an onion.

By Cushies Editorial Team · 2 min read · Updated 15 August 2026

Baby's size	About the size of an onion
Length	about 13 cm
Weight	about 140 g
Trimester	Second trimester, month 4

Your baby this week

Fat stores begin to build under the skin, and the skeleton is changing from cartilage to bone.

Your body this week

Your centre of gravity is shifting, so you may feel off balance.

Tip of the week

Wear comfortable, flat footwear.

Quick answers

How big is my baby at 17 weeks?

About the size of an onion: around 13 cm long and around 140 g.

How many months is 17 weeks pregnant?

17 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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