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Physically, We All Began As Female

Men have nipples because they are formed before the activation of the Y chromosome in embryonic development.

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We were all female

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Key Facts In This Video

  1. Physically speaking, all humans were once "female" in the womb—though some prefer to say we were gender neutral. 00:02

  2. The first 5–6 weeks of embryonic development involve only the X chromosome, not the Y chromosome. 00:32

  3. Nipples form before the activation of the Y chromosome in embryonic development. 01:28

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