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並前往https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/fetal-development/art-20046151

Fetal development: The 2nd trimester - Mayo Clinic

Twenty-one weeks into your pregnancy, or 19 weeks after conception, your baby is completely covered with a fine, downy hair called lanugo. The lanugo helps ...

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