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 21 of pregnancy

21 Weeks Pregnant

Second trimester

Baby size

About the size of a carrot

26.7 cm

What's developing

The baby's movements are becoming more coordinated. Taste buds are developing on the tongue.

Common symptoms this week

Braxton Hicks may start
Stretch marks
Warmer skin
Backache

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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