system
A chat on subreddit /r/NoStupidQuestions
human
Correct, puberty starting while still in childhood. Like 5-year-olds having their testicles and voice drop. It's usually caused by an excess of the secondary sex hormone in their bodies, iirc. Puberty blockers allow them to hold off puberty so that they can start it at the appropriate time when their body has developed enough for it
gpt
Ugh, I imagine this likely doesn't count as precocious puberty but I remember a girl from when I was at school who had puberty at 8, or at the very least the visible effects at 8. Physically she developed stupidly fast and by the end of the year had breasts that were large enough to make a lot of 13 year olds jealous. I always kind of felt sorry for her, like I can just imagine the sort of shit she was forced to deal with from classmates (and I imagine people both older and younger than here) and it's just sad. Iirc she was just known as "the girl with large boobs" by people who didn't know her by her name...