I think its all very complicated and that its an individual issue for each person who changes sex.
I think gender is a myth and society constructed, blue and pink etc, and gender is not a idenity relating to the soul, its related to the body in subtle ways and also partly the mind and patterns of behaviour. Sex is a fact and is to do with the body, biological hormones and 'down stairs', Sex is either male or female but sometimes a bit more complicated. Sexuality is not a idenity, its what someone finds arrousing, and is difficult to define in almost all realtionships aka, so many divorces etc etc.
Thats all I think on the matter, as for children receving treatment, thats a matter on a individual basis and am sick of over generalising on the news and the media. Why is it our business to debate over this when its other people that we haven't met, a small number of people at that matter.