Second trimester · Week 18 of 40
18 weeks pregnant: the size of a bell pepper
Ears are in their final position and the baby may hear sounds.
Reviewed against ACOG, NHS and WHO guidance · Updated November 2026
Typical size
About 14 cm · 190 g
45% of the way to your due date
Your baby this week
Ears are in their final position and the baby may hear sounds.
Your body this week
You may feel dizzy if you stand up quickly — your blood pressure is naturally lower now.
Tip for week 18
Rise slowly and drink enough water.
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.