Pregnancy week by week / Week 40
40 weeks pregnant
That’s 9 months — the third trimester, with 0 weeks to go.
Baby size at 40 weeks
Your baby is about 51.2 cm (20.2 in) long and weighs about 3.46 kg (7 lb 10 oz) — roughly the size of a small pumpkin.
What’s happening at 40 weeks
Your due date is here! Only about 1 in 20 babies arrive exactly on the due date, so a little wait either side is completely normal.
Common symptoms at 40 weeks pregnant
- •Signs of labour: contractions
- •Waters breaking
- •"Bloody show"
- •Strong pelvic pressure
- •Backache
Every pregnancy is different — you may have all, some or none of these. Contact your doctor or midwife about anything that concerns you.
Count down to your due date
If you’re 40 weeks pregnant today, your due date is around Tuesday, June 16, 2026. Adjust the date below and create a free countdown to share.
First day of your last menstrual period (how doctors date a pregnancy)
⚕️ This is an estimate based on Naegele’s rule (40 weeks from your last period). Only about 1 in 20 babies arrive on the exact due date. Always confirm with your doctor or midwife.
FAQ
How many months is 40 weeks pregnant?
40 weeks pregnant is about 9 months, in the third trimester.
How big is the baby at 40 weeks?
At 40 weeks the baby is about 51.2 cm (20.2 in) long and weighs about 3.46 kg (7 lb 10 oz) — roughly the size of a small pumpkin.
What are the symptoms at 40 weeks pregnant?
Common symptoms around 40 weeks include signs of labour: contractions, waters breaking, "bloody show", strong pelvic pressure. Symptoms vary a lot from person to person — contact your provider if anything worries you.
When is my due date if I am 40 weeks pregnant?
If you are exactly 40 weeks pregnant today, your estimated due date is around Tuesday, June 16, 2026 — 0 weeks from now. Use the calculator below with your real last-period date for a personalised estimate.
See every stage on the pregnancy week-by-week guide or open the full due date calculator.