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 13 of pregnancy

13 Weeks Pregnant

Second trimester

Baby size

About the size of a lemon

7.4 cm

What's developing

You're at the end of the first trimester. Vocal cords are forming and the intestines have moved into the abdomen.

Common symptoms this week

More energy
Fewer bathroom trips
Visible veins
Higher libido for some

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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