20 weeks pregnant
Trimester 2 · about 4 months · baby is about the size of a banana.
Baby at 20 weeksa banana25.6 cm (head to heel) · 300 g
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Your baby this week
Halfway. Measurements switch to head-to-heel from here, which is why length seems to jump.
You this week
The top of your uterus is around your belly button.
Frequently asked questions
How many months is 20 weeks pregnant?
20 weeks is about 4.6 months of gestation, counted from the first day of your last period. You are in the second trimester.
How big is a baby at 20 weeks?
Around 25.6 cm (head to heel) long and 300 g, roughly the size of a banana. 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.