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16 Weeks Pregnant

At 16 weeks, the baby’s movements are more coordinated. You may feel the first flutters soon.
Baby is about the size ofAn avocado
LengthAbout 11.6 cm
WeightAbout 100 g
Week 16 of 40, second trimester24 weeks to go

Your baby at 16 weeks

The baby’s eyes can now move, and its movements are becoming more coordinated. The heart pumps a large amount of blood every day.

Your body at 16 weeks

Some people feel the first flutters of movement between 16 and 20 weeks, often earlier in a second pregnancy. They can feel like bubbles or a light tapping.

Your checklist this week

  • Ask about the whooping cough (pertussis) vaccine. Timing advice differs by country, so check with your doctor or midwife.
  • Make sure your mid-pregnancy anomaly scan is booked.
  • Practise lying on your side to sleep.
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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.