There seem to be some..."trans women have more masculine brains than cis women" Are you sure that part's right?

On the overall issue. I have had people say that I count as trans because I'm a tomboy, which is utterly ridiculous. I'm not trans.

I also have a friend who is a trans woman. And a tomboy.

Gender identity, gender expression, it's all complicated.

And no, nobody is giving hormones to five-year-olds, only hair cuts and clothes. If it's a phase and they grow out of it, what's the big deal? The vast majority of trans youth aren't transitioning medically that early. Those that are are strongly gendered, have high dysphoria, and really need to.