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Third trimester

Week 39 of pregnancy

Your baby is the size of a small watermelon. The skin is smoother and the brain keeps growing fast.

Your baby is the size of a small watermelon

Length, head to heel
≈ 50.7 cm
Weight
≈ 3.3 kg

Your baby this week

  • A layer of fat keeps the baby warm and the skin becomes smoother.
  • The brain keeps growing fast, even after birth.
  • The baby has little room, but its movements should carry on as usual.

Your body this week

  • You may have contractions that come and go without becoming regular; this is called false labour.
  • Tiredness and waiting can be hard; rest helps.
  • Your cervix starts to soften and thin, ready for the birth.

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Read more for this stage

General information written by the mam.al editors. Every pregnancy is different and sizes are averages; it does not replace advice from your doctor or midwife. Sources include the NHS week-by-week guide to pregnancy. NHS. Contains public sector information licensed under the Open Government Licence v3.0.