Second trimester · Week 20 of 40
20 weeks pregnant: the size of a banana
Halfway! The baby swallows amniotic fluid and practises digesting.
Reviewed against ACOG, NHS and WHO guidance · Updated November 2026
Typical size
About 25 cm (head to heel) · 300 g
50% of the way to your due date
Your baby this week
Halfway! The baby swallows amniotic fluid and practises digesting.
Your body this week
The anatomy (anomaly) scan usually happens between weeks 18 and 22.
Tip for week 20
Write down questions for your mid-pregnancy scan.
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.