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[–]Vulptex 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

If that were true children wouldn't be so androgynous, and Androgen Insensitivity Syndrome wouldn't exist. The genes trigger certain hormones. The key is timing, as any changes are permanent. Most happen during puberty, but some of them take place prior to birth.