Humans exhibit some of the most obvious sexual dimorphism of almost any mammalian species. Quite aside from the unscientific approach that is taking a small number of isolated cases of triple chromosomes and applying the same principle to a huge group of individuals who don't have that condition, simple observed reality makes it clear, and has always made it clear, that there are two sexes and a person born into one cannot change to the other.
Humans exhibit some of the most obvious sexual dimorphism of almost any mammalian species. Quite aside from the unscientific approach that is taking a small number of isolated cases of triple chromosomes and applying the same principle to a huge group of individuals who don't have that condition, simple observed reality makes it clear, and has always made it clear, that there are two sexes and a person born into one cannot change to the other.