"In 2016, there’s fairly solid agreement about the proper course of treatment for otherwise healthy, stable young people who have persistent gender dysphoria, and who are either approaching puberty or older than that: You help them transition to their true gender. The process is different from person to person, but for an 11-year-old, it might include a round of puberty-blocking hormones to prevent the development of…
Your point being? In this case it is hormone blockers that delay the onset of puberty, to essentially "buy time" until the patient can competently make a decision on more invasive transitioning. This is reversible (just stop taking the drugs), and for young people with gender dysphoria, the onset of puberty can be extremely traumatic and often triggers a range of sometimes severely self-destructive behaviour, and so…
And additionally, I suspect that puberty and its associated natural hormones is a big part of what allows a teen to feel comfortable.