No child is capable of making a decision to switch ones gender. It is a parent's responsibility to raise their children to their biological gender. Once they become adults, then they are on their own.
I do not think it is uncommon for boys to desire to be girls. From a boy's vantage point, girls have it much easier. They do not have to help Dad with the yard work outside or do anything else strenuous or demanding from a physical standpoint. There is no pressure on girls to perform well in athletics. They get to wear comfortable clothes and flip-flops to school when it's hot outside. Girls (more than boys) are generally sheltered and protected. They do not have the pressure of having to learn a trade when they grow up and be a breadwinner for the family. It is not a bad thing if a girl states she just wants to forgo a career and stay home and take care of the house, in a submissive role with her parents or her husband. Of course, girls have their own kind of pressures and stresses to deal with but those are not apparent to a young boy who only sees the upside of being a girl.
It is the responsibility of the parents to guide that boy appropriately and develop him into a man. Not to let him put on a dress and pretend at being something he is not and can never be.
It is far worse than that now. Damn near everything that qualifies as children’s ‘entertainment’ these days features girls being the heroes. The girls are the ones who act like alpha males, do the fighting, win the day, while the boys are acting like losers hanging in the background.
It’s a huge uphill battle to raise a boy these days. Looking at some of these movies/tv shows, etc, it’s no wonder to me that some boys want to be girls.