Third trimester · Week 30 of 40
30 weeks pregnant: the size of a cucumber
The baby's brain grows rapidly and lanugo begins to shed.
Reviewed against ACOG, NHS and WHO guidance · Updated November 2026
Typical size
About 40 cm · 1.3 kg
75% of the way to your due date
Your baby this week
The baby's brain grows rapidly and lanugo begins to shed.
Your body this week
Fatigue and frequent urination return.
Tip for week 30
Start preparing your hospital bag.
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.