Children should definitely be able to take hormone blockers and transition when it's appropriate to have puberty. Cis children have hormonal treatment all the time. One of my cis brothers took spironolactone (a testosterone blocker) for his acne.

Conservatives scaremonger about endocrinology because the vast majority of the population doesn't know shit. Trans kids get consultation and treatment from professional endocrinologists, and the treatment is just as safe as any other puberty.

That said, most endos just put kids on blockers up until they're 18 and then move on to estrogen and testosterone from there through informed consent.