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By around 12 weeks of gestation, the fetus begins to swallow amniotic fluid and produce urine, which contributes to the fluid in the amniotic sac. During this period, the arms and hands develop, with fingers starting to form and nails beginning to appear. By the end of the first trimester, the basic structure of the limbs and digits is established, marking significant progress in fetal development.

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2mo ago

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