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What gender are babies at first?

Updated: 11/5/2022
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14y ago

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Embryos are genotypically a boy or a girl at the time of conception. The chromosomes they inherit make them either XX(girl) or XY(boy). Because a female is XX, she will always contribute an X chromosome, but because a male has both, X and Y (XY), the male could either contribute an X chromosome or a Y chromosome.

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