Second trimester
Week 18 of Pregnancy
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About the size of a bell pepper
5.6 in · 14.2 cm · 6.7 oz · 190 g (crown to rump)
Your baby this week
- The baby yawns, hiccups and rolls — all visible on ultrasound.
- Ears reach their final position on the head.
- Myelin, a protective coating, starts forming around the nerves.
What you may be feeling
- Pelvic aches
- Swollen feet by evening
- Restless sleep
Gentle tips for this week
- The detailed anatomy scan typically happens between weeks 18 and 22.
- Comfortable, supportive shoes are worth it now.
Common question for week 18
What happens at the anatomy scan?
A detailed ultrasound, usually at 18-22 weeks, that checks the baby's organs, growth, placenta position and amniotic fluid — and often reveals the sex if you want to know.
Every pregnancy is different. Sizes are averages, symptoms vary widely, and none of this replaces the guidance of your own provider.