Baby by Week
Week 33

Your week 33 guide

Brain, lungs, immunity, and temperature control continue maturing while space becomes limited.
Trimester

3

Month

8

Weeks left

7

Size at a glance

Comparison
Pumpkin
Length
48 cm
Weight
4.5 lb
Measurements are approximate. Healthy babies grow at different rates.

Baby development

The thinning uterine wall lets the fetus respond more clearly to light and dark.
The skull remains flexible while other bones harden.
Movement stays important even when the pattern shifts from kicks to rolls and stretches.

Your body

Insomnia, fatigue, overheating, swelling, and stretch-mark discomfort may increase.
Stronger movements can feel tender because there is less cushioning space.
Braxton Hicks contractions may be easier to recognize.

This week's checklist

Identify feeding support such as a lactation consultant if desired.
Learn infant CPR from a qualified course.
Prepare comfortable postpartum clothing and practical recovery supplies.

Call your care team

Contact maternity care immediately for reduced or changed movement, bleeding, leaking fluid, or regular painful contractions.
Seek urgent help for severe headache with vision changes, sudden swelling, chest pain, fainting, severe abdominal pain, or major breathing changes.

Medical information, not medical advice

Every pregnancy is different. Use this guide for general education and follow the advice of your own maternity care team. Do not delay urgent care because of something you read here.