Fetal development: The 3rd trimester - Mayo Clinic
https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/fetal-development/art-20045997
WEBJun 3, 2022 · Fetal development 31 weeks after conception. Thirty-three weeks into your pregnancy, or 31 weeks after conception, your baby's pupils can change size in response to a stimulus caused by light. His or her bones are hardening. However, the skull remains soft and flexible.
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