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 18 of pregnancy

18 Weeks Pregnant

Second trimester

Baby size

About the size of a bell pepper

14.2 cm

What's developing

You're inside the anatomy scan window (18–22 weeks). Yawning, hiccuping and stretching are all happening.

Common symptoms this week

Feeling movement
Leg cramps
Backache
Belly button changes

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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