40 weeks pregnant
Trimester 3 · about 9 months · baby is about the size of a small pumpkin.
Baby at 40 weeksa small pumpkin51.2 cm · 3.5 kg
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Your baby this week
Your estimated due date. Only about 4–5% of babies arrive on it.
You this week
Most first babies arrive within a week or so either side.
Frequently asked questions
How many months is 40 weeks pregnant?
40 weeks is about 9.2 months of gestation, counted from the first day of your last period. You are in the third trimester.
How big is a baby at 40 weeks?
Around 51.2 cm long and 3.5 kg, roughly the size of a small pumpkin. These are averages; individual babies vary.
Not sure which week you're in? The pregnancy calculator works it out from your last period or due date.