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23 Weeks Pregnant

At 23 weeks, the baby’s lungs are developing. You may feel Braxton Hicks practice contractions.
Baby is about the size ofA grapefruit
LengthAbout 28.9 cm
WeightAbout 500 g
Week 23 of 40, second trimester17 weeks to go

Your baby at 23 weeks

Blood vessels are developing in the lungs to prepare them for breathing. The baby can hear louder sounds from outside the womb.

Your body at 23 weeks

You may start to feel your bump tighten now and then. These painless practice contractions are called Braxton Hicks contractions.

Your checklist this week

  • Learn the difference between Braxton Hicks and real contractions: practice contractions are usually irregular and ease when you rest or move.
  • Contact your maternity unit if tightenings become regular or painful.
  • Drink water: dehydration can make tightenings more frequent.
Week 22
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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.