Writing at The Federalist, Jason Rantz reports that after making claims that surgical and hormonal "gender affirming care" caused teenaged depression and thoughts of suicide to "plummet," the University of Washington Medical School has withdrawn those claims.
The article which has the actual numbers, shows that declines in depression and suicidal thoughts were quite small, and given sample sizes, probably not significant and perhaps attributable to the placebo effect. Meanwhile examples of people who had the treatments and now regret them keep surfacing.
There is enough question surrounding these invasive practices to conclude they should be limited by law to adults. Such individuals can take responsibility for their own decision to undergo intentional mutilation.
One suspects that depressed, suicidal children are being asked if they feel gender confused and in their discomfort are being encouraged to hope "gender affirming" treatments could help them feel okay. The evidence seems to suggest it doesn't do so often enough to risk irreversible outcomes.
Direct treatment of depression and feelings of self-loathing would seem to be the preferred treatment modality.