[flamesabers]

As for testicles changing to ovaries, maybe, but how would a womb grow? It's certainly the stuff of Science Fiction.... the Tleilaxu Face Dancers from Dune managed it, I think.

I suppose it'll take a pill that can transform you into Kate Upton to achieve the complete transformation.

I think the best bet is stopping puberty for every kid until they know what they are, but that's probably impractical!

I agree. I'm sure at least some parents and children would not want to delay puberty. If anything, I suspect a number of adolescents would rather mature sooner than later.