When a kid thinks something that is fundamentally untrue, you need to wait a while and see if these feelings even continue

My brother wanted to be a girl when he was seven. He doesn't anymore. When I was a kid, I wanted to eat cupcakes all day and change my name to Princess. Now everyone knows that if I ate cupcakes all day, I'd end up dying of obesity or contracting diabetes. Simply because someone (especially a minor, that shouldn't be making these important decisions so early!) feels something, it doesn't mean they should chop off their genitals. It's also significantly shown that gender reassignment surgeries are done for profit, and that they actually aren't good for the patient medically. It is also shown that surgery doesn't even necessarily quell these doubts of gender. I think that no minor should be legally allowed to mutilate themselves.