Baby by Week
Week 30

Your week 30 guide

Fat stores build quickly while bone marrow, eyes, hands, and nails continue preparing for birth.
Trimester

3

Month

7

Weeks left

10

Size at a glance

Comparison
Head of lettuce
Length
43 cm
Weight
3 lb
Measurements are approximate. Healthy babies grow at different rates.

Baby development

Hands are fully formed and fingernails keep growing.
Bone marrow now produces red blood cells.
Lanugo begins thinning as fat improves temperature regulation.

Your body

Fatigue, insomnia, constipation, swelling, stretch marks, and Braxton Hicks contractions may intensify.
Strong movements can sometimes feel surprising or uncomfortable.
Carrying more weight can strain the back and pelvis.

This week's checklist

Review your birth plan with your clinician and support person.
Continue childbirth or newborn-care education.
Ask whether iron intake or testing needs attention.

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.