39 weeks pregnant
Third trimester about 8 months
At 39 weeks pregnant, your baby is about the size of a small watermelon.
Baby this week
About 50cm. The baby is fully developed and ready for birth. The skull bones are still slightly separate to allow them to compress during delivery. The baby could be born any moment.
Did you know? The ideal birth window is 39–40 weeks — research shows babies born at 39 weeks have fewer complications than those born at 37–38 weeks, even though all are technically full term.
What she may be feeling
- Intense pelvic pressure
- Labor signs may be present
- Loss of mucus plug
- Bloody show
- Braxton Hicks or real contractions
- Extreme fatigue
- Nesting
- Emotional overwhelm
Tips for her this week
- The ideal birth window is weeks 39–40. Your baby is fully ready.
- You may feel surges of energy (nesting) followed by exhaustion.
- Try to rest between contractions if labor begins — pace yourself.
- You are about to do one of the most remarkable things a human can do. You are ready.
For partners
- This is the ideal birth window. Be present, be calm, be available.
- If labor doesn't start this week, don't panic — due dates are estimates, not deadlines.
- Tell her she's about to do something incredible and you'll be right beside her.
- Make sure you've eaten, slept, and are as rested as possible — you need energy for labor support.
Partner to-do list
- Be available and present at all times
- Rest and eat well — you need energy for labor support
- Say something heartfelt and meaningful to her today
- Have the hospital bag by the door and keys accessible
This week together
- Have a meaningful conversation about how you're both feeling
- Rest together while you can
- Confirm all logistics: car, bag, route, who to call
- Tell each other what you're most looking forward to about becoming parents
When to call your doctor or midwife
Contact your care provider right away, or call emergency services, if she has:
- Regular contractions 5 minutes apart lasting 60 seconds for 1 hour — call your provider
- Water breaking — call immediately
- Decreased fetal movement
- Heavy bleeding — go immediately
Trusted guidance: NHS: Pregnancy · NHS: Pregnancy complications · ACOG: Pregnancy · Pregnancy Info: Your pregnancy
Common questions
How big is the baby at 39 weeks?
At 39 weeks pregnant, your baby is about the size of a small watermelon. About 50cm.
How many months is 39 weeks pregnant?
39 weeks pregnant is about 8 months, in the third trimester.
What can partners do at 39 weeks?
This is the ideal birth window. Be present, be calm, be available. If labor doesn't start this week, don't panic — due dates are estimates, not deadlines.