That's where the problem is. Repub propaganda won on this issue even it's factually false and totally overblown regarding its occurence.
In the US, there are no sex surgeries on trans kids/children. Nobody is being castrated, there are no records of pre-teens receiving genital surgeries as the guidelines recommend to wait till 17-18 for this type of surgeries.
You can see some data here :
National Estimates of Gender-Affirming Surgery in the US
Unfortunately, they put the first age bracket at 12-18 which includes legal adults so so that's stupid on that study but that's the only data I found.
Also, there's nothing recent so only from 2016-2020 but then there were 4,000 surgeries for the 12-18 during those 5 years. That's averaging 800 a year and of those 10% were sex surgeries (that number includes 18 year olds).
From the bit I looked, the actual advised minimum age I consistently found was 16 for genitalia surgeries, for example those pro-trans people and they insist on it being exceptional and being approved by parents and doctors.
Get the Facts on Gender-Affirming Care
In the US, it is said to be 300k trans teens (13-17) out of 25M teens (1.5%). And there are tops, 100 genitalia surgeries a year (likely for 16-18). That means when talking about sex surgeries for teens, we're talking about 0.0004% (4 per million !) of all teens per year at the max. That issue is dangerously overblown.