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 31 of pregnancy

31 Weeks Pregnant

Third trimester

Baby size

About the size of a coconut

41.1 cm

What's developing

The baby can turn their head from side to side. All five senses are functional.

Common symptoms this week

Braxton Hicks
Leaky breasts
Backache
Shortness of breath

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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