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17 Weeks Pregnant

At 17 weeks, fat is starting to form under the baby’s skin. Round ligament twinges are common.
Baby is about the size ofA pear
LengthAbout 13 cm
WeightAbout 140 g
Week 17 of 40, second trimester23 weeks to go

Your baby at 17 weeks

Fat is starting to build up under the baby’s skin, which will help keep it warm after birth. The skeleton continues to change from soft cartilage to bone.

Your body at 17 weeks

As your uterus grows, you may feel sharp twinges low on either side of your tummy. This is often round ligament pain, caused by the ligaments stretching.

Your checklist this week

  • Move slowly when you change position to ease ligament pain.
  • Wear comfortable, supportive shoes.
  • Contact your doctor if pain is severe or does not go away.
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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.