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20 Weeks Pregnant

At 20 weeks, you are halfway through your pregnancy. The baby is about the length of a banana.
Baby is about the size ofA banana
LengthAbout 25.6 cm (head to heel)
WeightAbout 300 g
Week 20 of 40, second trimester20 weeks to go

Your baby at 20 weeks

You are halfway there. From now on, length is usually measured from head to heel instead of head to bottom. The baby is swallowing amniotic fluid and producing meconium, which will be its first poo.

Your body at 20 weeks

The top of your uterus is now around the level of your belly button. Movements usually become easier to feel.

Your checklist this week

  • Have your anomaly scan if it has not happened yet. Tell the sonographer if you want to know the baby’s sex.
  • Start getting to know your baby’s usual pattern of movements.
  • Book antenatal or birth preparation classes.
Week 19
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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.