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40 Weeks Pregnant

At 40 weeks, you reach your due date. The baby is ready to be born.
Baby is about the size ofA watermelon
LengthAbout 51.2 cm
WeightAbout 3.5 kg
Week 40 of 40, third trimester0 weeks to go

Your baby at 40 weeks

This is your due date week. The baby is ready to be born. Only a small number of babies arrive exactly on their due date, and many first babies come a little later.

Your body at 40 weeks

If labour has not started, your doctor or midwife will talk to you about your options, such as a membrane sweep, and about induction if you go past 41 weeks.

Your checklist this week

  • Keep monitoring your baby’s movements and contact your maternity unit straight away if they change.
  • Ask about a membrane sweep and when induction would be offered.
  • Rest and try to stay comfortable while you wait.
Week 39
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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

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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.