Week 20 of Pregnancy
The halfway mark. The anatomy ultrasound takes a detailed look at every fetal structure.
Fetal size
Banana
- Length
- 16.4 cm
- Crown-rump (CRL)
- Weight
- 300 g
Fetal development
- Measurement switches from crown-rump length to crown-to-heel length.
- Hair starts to grow on the head.
- Swallowing and sucking reflexes develop.
Maternal changes
- The top of the uterus reaches the belly button.
- Typical weight gain so far: 4–6kg.
Recommended checkups
- The 20-week anatomy scan is one of the most important screening exams.
Jump to week
Textbook averages. Individual variation is wide and this is not medical advice — confirm with your OB.