Baby by Week
Week 39

Your week 39 guide

The baby is full term and continues receiving antibodies and nourishment through the placenta.
Trimester

3

Month

9

Weeks left

1

Size at a glance

Comparison
Watermelon
Length
≈ 51–56 cm
Weight
6.5–9 lb
Measurements are approximate. Healthy babies grow at different rates.

Baby development

The immune system uses antibodies transferred from you.
The umbilical cord continues delivering oxygen and nutrients until birth.
Growth and movement continue, though the uterus is very crowded.

Your body

Pelvic pressure can make walking, sleeping, and changing position harder.
Contractions, discharge changes, and other signs of labor may appear.
Excitement, impatience, and anxiety are all understandable.

This week's checklist

Follow your clinician's plan for monitoring and when to arrive at the birth location.
Keep tracking the baby's normal movement pattern.
Protect time for rest, food, hydration, and calm support.

Call your care team

Contact maternity care immediately for reduced movement, bleeding, leaking fluid, or contractions that match your labor instructions.
Seek urgent help for severe headache with vision changes, sudden swelling, chest pain, fainting, severe abdominal pain, or trouble breathing.

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.