30 Weeks Pregnant

At 30 weeks, the baby’s lanugo starts to disappear and the brain grows fast. Tiredness often returns.

Baby is about the size ofA cucumber

LengthAbout 39.9 cm

WeightAbout 1.3 kg

Week 30 of 40, third trimester10 weeks to go

Your baby at 30 weeks

The lanugo hair is starting to disappear, and the brain is growing quickly. The baby’s bone marrow is now making red blood cells.

Your body at 30 weeks

Tiredness often returns in the third trimester. You may feel emotional or anxious about the birth, which is very normal.

Your checklist this week

Start writing a birth plan to share with your care team.
Think about what to pack in your hospital bag.
Talk to your doctor or midwife if low mood or anxiety are affecting you.

Not sure which week you are in?

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.