The situation I mentioned was a case of Gender mis-assignment at birth, whereas for many it is a psychological thing. Not surprising that the changes appear in early teenage years when puberty occurs and hormones are all over the place. I think it is right to wait until the child is 16 when things have settled down, before there is any medical intervention or labels attached. I am glad that there are moves in schools and society in general to allow people to be 'gender fluid' and believe this change will benefit all if it puts an end to the rigid divisions in society along gender lines. We are all people first - babies, children, pupils, students, friends, parents, grandparents. Forcing people to conform to gender stereotypes may stunt the growth of their own unique personality, talents, career prospects, etc.
Time to stop referring to 'Boys and Girls', Ladies and Gentlemen', 'the men in the factory and the girls in the office', when children, grownups, workers, members, whatever include all.