"But what if that kid is making a mistake?!"

Then that is their mistake to make.

Of the already minority population of Trans people, a minority of them report de-transitioning; and a minority of them report doing so out of a sense of regret for the initial transition. Source

I know I much prefer having a minority of a minority make a mistake and course correct, than having a blanket ban on all transitions cause the wrong people think they know better than the lived experiences of Trans people.