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30 Weeks Pregnant: Baby Size, Development & Symptoms

Your baby is about the size of a large cucumber.

By Cushies Editorial Team · 2 min read · Updated 20 July 2026

Baby's sizeAbout the size of a large cucumber
Lengthabout 40 cm
Weightabout 1.3 kg
TrimesterThird trimester, month 7

Your baby this week

The baby’s bone marrow now makes red blood cells.

Your body this week

You may feel more breathless as the uterus presses up.

Tip of the week

Pace yourself and rest when you need to.

If your baby arrives now, they are born early (preterm) and may need some time in a special newborn care unit. Know the signs of preterm labour.

Quick answers

How big is my baby at 30 weeks?

About the size of a large cucumber: around 40 cm long and around 1.3 kg.

How many months is 30 weeks pregnant?

30 weeks is in month 7 of pregnancy, in the third 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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