Can you provide citations or sources?

These are things I beleive as well. A Good friend of mine is a doctor, who has a trans daughter. She was told the earliest her daughter could have surgery was 18. She also was told her daughter couldn't go on HRT until she was 16, but could use puberty blockers until then. HRT I know often causes infertility and aren't reversible. However, puberty blockers are different and I read from the may clinic may be reversible.