How accurate is a due date?

A due date is an estimate. Only about 1 in 20 babies arrive on it; most are born within two weeks either side.

Can my due date change?

Yes — early ultrasound measurements can refine it. Later scans usually do not shift an established date.

Are these baby-size comparisons exact?

The fruit and vegetable comparisons are friendly approximations of average length. Every pregnancy is unique — your baby may be a little larger or smaller.

Week 39 of pregnancy

39 Weeks Pregnant

Third trimester

Baby size

About the size of a mini watermelon

50.7 cm

What's developing

The baby is full term. Fat continues to build under the skin to help regulate body temperature after birth.

Common symptoms this week

Pelvic pressure
Braxton Hicks
Cervical changes
Diarrhea

This is an estimate for information only — only about 1 in 20 babies arrive on their due date. Always confirm dates with your midwife or doctor.

Frequently asked questions

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