Schools aren't involved in medical transition.

edit, responding to below:

By "heavy advertising" do you mean letting kids know it is a thing that exists? Because that's just teaching kids the facts of life, something schools have a responsibility to do (since apparently you're not willing to tell your kids that medical transition exists?) It falls under the same bucket as sex education, another thing that schools should do regardless of whether the parents think it's OK or not.

Schools don't make medical decisions, doctors do.

edit 2:

MEDICAL transition.

This [0] that might interest you, then, if you think schools aren't involved in transitioning children.

Relevant quote:

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    Even though the policy states that “the goal in all cases is to strive for consensus between parents/guardians and student as to the application of this policy,” it adds that the decision to participate in the “gender transition plan” belongs to the student, and “does not require additional parent/guardian consent”—unless parental/guardian rights under the Family Educational Rights and Privacy Act (FERPA), or other applicable law, would be implicated.

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[0] https://www.ntd.com/parents-and-legal-guardians-excluded-fro...

The primary source cited in the article seems to have been wiped and replaced with "under review", but based on the article it seems it was primarily that if a trans kid is out at school, staff shouldn't assume they're out at home and so they should default to using the kid's legal name when communicating with parents. This seems like a good policy; if someone doesn't want to come out to their parents, it may be because they fear being beaten or thrown out of their home if they do.

"Schools transitioning children" is not a coherent phrase. "Transition" in the gender sense is not a transitive verb; transition is not something done to someone by others, is something that person does themselves.