Not everyone is born either as a male or as a female
No, I’m sorry I don’t have any numbers. I’m not arguing they are common; in fact I believe they are rare, but they do exist. Something else I don’t know is the histogram of proportionality: how many are 50/50 vs. how many are 70/30 or even 99/1? It is quite possible that the 99/1’s present as “born a boy” or “born a girl,” but yet mentally the people are conflicted about their genders, especially if the 1% of other cells happen to be in their brains, where the thoughts of who you are as a person are formed. But this is speculation on my part, My point is that not everyone is born unambiguously as a boy or as a girl.