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12 Weeks Pregnant

At 12 weeks, the baby has reflexes and the kidneys are working. Your uterus is rising out of the pelvis.
Baby is about the size ofA lime
LengthAbout 5.4 cm
WeightAbout 14 g
Week 12 of 40, first trimester28 weeks to go

Your baby at 12 weeks

Reflexes are developing: the baby can curl its fingers and make sucking movements. The kidneys have started to make urine.

Your body at 12 weeks

Your uterus is rising out of your pelvis, so you may need to pass urine less often. Many people choose this time, after the first scan, to share their news.

Your checklist this week

  • Have your dating or NT scan if you have not yet. Our Ultrasound Due Date Calculator uses your scan result.
  • Folic acid is most important until 12 weeks. Ask about continuing a prenatal vitamin, including vitamin D.
  • Think about when to tell your employer.
Week 11
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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.