First trimester · Week 13 of 40
13 weeks pregnant: the size of a lemon
Vocal cords form and the intestines move into the abdomen.
Reviewed against ACOG, NHS and WHO guidance · Updated November 2026
Typical size
About 7.4 cm · 23 g
33% of the way to your due date
Your baby this week
Vocal cords form and the intestines move into the abdomen.
Your body this week
Energy often starts to return as you reach the end of the first trimester.
Tip for week 13
Gentle exercise like walking or prenatal yoga is safe for most pregnancies.
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.