Week by week · Third trimester

37 weeks pregnant

About the size of a winter melon

Roughly 49 cm (19 in) from head to heel, and around 2.9 kg (6.4 lb)

Month 9of 9
3 weeksto go
3rdtrimester

Not sure of your week? Work it out from a date

An illustrated winter melon

From week 37 your baby is considered early term. Labour could start any day, though most first babies take a little longer.

Your baby this week

Practice
Your baby is practising breathing, sucking and grasping.
Head down
Most babies are head down by now.
Ready
Most organs are ready to work on their own.

What you might notice

  • Losing your mucus plug, sometimes with a little blood. Labour may still be days away.
  • Stronger Braxton Hicks. How to tell them from contractions.
  • Nesting and restlessness.
  • Lower back ache that comes and goes.

Call your midwife, doctor or maternity unit now if

  • Your waters break, or you think they might have
  • Your contractions are regular and getting stronger, or you're not sure
  • You have bleeding, or your baby's movements have slowed down or changed
  • You have a bad headache, blurred vision or sudden swelling

Day or night. If something just feels wrong, that's reason enough to call.

Coming up

Any day

Labour could start. Know who to call and when.

Week 40

Your due date. Most babies arrive within two weeks either side.

Questions to bring to your next appointment

  1. What's my plan if labour starts at night?
  2. When should I come in once contractions start?
  3. What happens if I pass my due date?
Add your own, then bring the list with you.

For your partner

Keep the bag, the car seat and the phone numbers ready, and know how you'll get there at any hour.

NUGA follows you week by week

Enter your due date once and NUGA knows you're at week 37. The day before each appointment, it gathers what you've noted and the questions to bring.

Download on theApp StoreAvailable now

General information, not medical advice. Every pregnancy is different, and your midwife or doctor knows yours. Last updated October 2026.

Every week

First trimester

Second trimester

Third trimester