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21 Weeks Pregnant

At 21 weeks, the baby has sleep and wake periods and movements are stronger. Leg cramps are common.
Baby is about the size ofA carrot
LengthAbout 26.7 cm
WeightAbout 360 g
Week 21 of 40, second trimester19 weeks to go

Your baby at 21 weeks

Movements are getting stronger, and the baby now has periods of sleeping and waking. Taste buds are working, and the baby can taste flavours from your diet in the amniotic fluid.

Your body at 21 weeks

Leg cramps, especially at night, and varicose veins are common as your blood volume rises and your uterus presses on blood vessels.

Your checklist this week

  • Stretch your calf muscles before bed to help with cramps.
  • Put your feet up when you can and avoid standing for long periods.
  • Keep drinking plenty of water.
Week 20
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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.