I suppose the pregnancy may have started out as male female twins and one was absorbed by the other creating a chimera with all the male dna going to the brain. Just a theory.
Also if you transgender a young child, you are taking away the opportunity for the child of being the sex the child was born. What if when she is 12yrs old she wants to wear a dress and date a boy?
The biggest loss I see is that I the child is given so called sex reassignment surgery the child looses any future chance at procreation.
Also a lifetime of hormone replacement therapy is not with out risk.
The decision to have the surgery should left until adulthood when the individual can make an informed choice having weighed the risk against the benefits.