Second trimester · Week 24 of 40
24 weeks pregnant: the size of a corn
Lungs develop branches and cells that produce surfactant.
Reviewed against ACOG, NHS and WHO guidance · Updated November 2026
Typical size
About 30 cm · 600 g
60% of the way to your due date
Your baby this week
Lungs develop branches and cells that produce surfactant.
Your body this week
Glucose screening for gestational diabetes usually happens between weeks 24 and 28.
Tip for week 24
Ask your provider when to schedule your glucose test.
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.