Another thing that just struck me is the deep confusion that will come once this kid learns about biological genitalia and changes throughout adolescence.
When they start learning about the true biological differences (not social, not in the brain for identity, but chromosomal) and they realize they have a penis and not a vagina, this child will be more deeply confused and will probably have some type of complex
“How come I don’t have a vagina? I thought I was a girl”
“I must be lesser than the other ‘regular’ girls since I was born this way instead of that way”
“How come I’m developing facial hair?”
That kid is in for it