How do you propose kids, or anyone, who feel their body is the wrong shape and isn't theirs, be dealt with?
The same way health care deals with children with anorexia - therapy that explores why they feel like they do, not giving them drugs and surgery to attain their ideal weight.
Who's normal are they trying to fit into. And why?
Children with body dysphoria are often gay or non conforming to society's stereotypes. If society was more accepting of people who didn't conform perhaps they wouldn't feel the need to aspire to be the opposite sex. Wouldn't you prefer everybody was comfortable with their body as it is, rather than believing drugs and surgery will solve the problem?
Surgery is routinely carried out on people who feel that there body is the wrong for them. Be it parts not the correct shape/size, or weight. You offer most a quick way of "fixing the issue" via surgery, or just talking about how they should just accept that their body is how it's meant to be.
The answer is to change how society behaves not encourage people to change their bodies to fit arbitrary stereotypes, especially one that is never achievable like changing sex.
Tell that to someone who's being bullied at school because they don't feel that their body is right for them.
Then you stop the bullying, you don't physically change a child with meds and surgery to accommodate bullies.