Lord lord lord, soberodent; take your fight to opposing the oppressive gender stereotypes which force children of whatever sex to conform with things which don't fit them, instead of attacking the fact that children are malaffected by this pressure.
It really is not possible for human beings to change sex: science (which you have appealed to) is pretty clear on that. They can and do mess with their gender, which is mutable and depends on their decision and how they choose to appear, but they cannot decide to have a different sex from the one they developed in utero.