結果 : what does gestation period mean for kids
3:54

Pregnancy 101 | National Geographic

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development of the placenta-labor and delivery - birth-embryology-placental maternal side formation

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How food reaches your baby

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What does gestation period mean?

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ovulation and menstrual cycle often called period|medical animationDandelionTeam #ovulation #period

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The three different ways mammals give birth - Kate Slabosky

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