Week 17 of Pregnancy
Fat begins to accumulate and the placenta is fully established.
Fetal size
Pear
- Length
- 13 cm
- Crown-rump (CRL)
- Weight
- 140 g
Fetal development
- Brown fat begins to accumulate in preparation for body temperature regulation.
- Bones continue to harden.
- Hearing becomes sensitive enough to react to loud sounds.
Maternal changes
- The bump shifts your center of gravity, often causing lower back pain.
- Mild swelling in the feet can begin.
Recommended checkups
- Schedule the anatomy scan (the week 20 detailed ultrasound).
Jump to week
Textbook averages. Individual variation is wide and this is not medical advice — confirm with your OB.