DueNest
All calculators

39 Weeks Pregnant

At 39 weeks, your baby is full term. Labour could start any day.
Baby is about the size ofA small watermelon
LengthAbout 50.7 cm
WeightAbout 3.3 kg
Week 39 of 40, third trimester1 weeks to go

Your baby at 39 weeks

Your baby is now full term. Its brain and lungs are still maturing, which is why doctors avoid planned delivery before 39 weeks unless there is a medical reason.

Your body at 39 weeks

You may feel impatient and uncomfortable. Contractions, back pain or a show can all be signs that labour is getting close.

Your checklist this week

  • Time contractions when they start: how long they last and how far apart they are.
  • Call your maternity unit when contractions are regular and strong, or as you were advised.
  • Stay in touch with your care team about any worries.
Week 38
All weeks
Week 40

Not sure which week you are in?

Use our Due Date Calculator or Pregnancy Week Calculator to find out exactly how far along you are.

Your baby this week

Sign up for a short weekly email about your baby’s growth, what is changing in your body and what to do next. Free, and you can unsubscribe at any time.

Jump to a week

Find your week

When to call your doctor

  • Bleeding from your vagina
  • Severe pain in your tummy
  • A bad headache, blurred vision or sudden swelling
  • Fluid leaking from your vagina
  • Fever, or pain when you pass urine
  • Later in pregnancy, your baby moving less than usual

In an emergency, call your local emergency number.

Based on ACOG and NHS guidance. Sizes are averages: every baby grows at its own pace.