The typical process is to provide puberty blockers for a long period of evaluation, then if deemed appropriate, start the transgender minor on hormones congruent with their gender identity, usually after a couple years or so. This can prevent depression and suicidality and greatly increase quality of life.
If they are denied all gender affirming care, then they can end up with lifelong depression (like I have) or worse. Dysphoria is miserable to live with. I literally wake up every single day and think about this, wishing I had been able to go on puberty blockers and take estrogen when I was a teenager. Anyone who has been on this forum for a long period of time and who has seen my old blogs knows just how miserable I've been, especially my first blog back before my transition since I joined INFJs when I was 19. That misery could have been prevented.
I would encourage everyone to look into the studies posted above, look at what actual medical organizations are saying (which I posted earlier), and learn about the actual process involved with puberty blockers. If someone goes on puberty blockers and it turns out that transition isn't the best option for them, they can just go off of the puberty blockers and continue on with puberty of their birth assigned gender.
There is an extreme amount of misinformation and hostile actors from conservative and other hate groups who just plain hate trans people. And I'm disappointed to see people on the forum parroting the bigotry fed to them by those groups, creating a hostile environment for transgender forum users. Reading over this thread, it should be obvious they aren't interested in actual discussion. They just want to punch down on a minority that has been targeted politically because they are ignorant, bigots, maybe religious, idk.
My IMs are open if anyone wants to discuss this more in a civilized manner, but for my own mental health, I can't keep feeding the trolls in this thread. I've left the important information here for others to consider.