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 40 of pregnancy

40 Weeks Pregnant

Third trimester

Baby size

About the size of a small pumpkin

51.2 cm

What's developing

This is your estimated due date. Only about 1 in 20 babies actually arrive on this day — most come a bit before or after.

Common symptoms this week

Contractions
Water breaking possible
Backache
Cervical dilation

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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