Nine Moons
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First trimester

12 weeks pregnant

Quick answer

At 12 weeks pregnant, your baby is about the size of a lime: around 5.4 cm crown to rump and 14 g. Reflexes appear. Baby can open and close their fingers.

Your baby at 12 weeks

Reflexes appear. Baby can open and close their fingers.

SizeAbout the size of lime
Length5.4 cm crown to rump
Weight14 g

Your body at 12 weeks

Energy often starts to return by the end of this stretch. Your dating scan and first screening tests usually happen now.

For your partner

The first scan is a big moment. Be there.

  • Book leave for the scan
  • Write down questions for the doctor
  • Start a simple baby budget together

Call your doctor or hospital straight away for bleeding, severe pain, fluid leaking, severe headache or vision changes.

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