Second trimester · Week 21 of 40
21 weeks pregnant: the size of a carrot
Movements become stronger and more coordinated.
Reviewed against ACOG, NHS and WHO guidance · Updated November 2026
Typical size
About 27 cm · 360 g
53% of the way to your due date
Your baby this week
Movements become stronger and more coordinated.
Your body this week
You may notice stretch marks or leg cramps.
Tip for week 21
Stretch your calves before bed to help prevent cramps.
Carry this guide in your pocket
Mamivaa is a free pregnancy app with a week-by-week tracker, vitamin and water reminders, a food scanner and a baby checklist.
Start freeThis guide offers general information and does not replace advice from your doctor or midwife. If something feels wrong, contact your provider or emergency services.