Based on ... what? your hatred of trans people? Or sky daddy said so? Sorry, you clearly have no idea what you're talking about.

Yeah they can. And guess what, they can decide later they're not trans anymore ooooo scawwy

Better to affirm the gender they feel early so they have plenty of time experiencing it so on the low change they realize they’re not the gender they thought they were they have plenty of time and were able to experience it.

Really?

Where’d you get your doctorate?

Or are you just shitting directly into your mouth to spew it back out?

And how do you know this information?

People can know they don't fit neatly in one of two boxes.

I grew up with a trans girl 35 years ago. We knew from the moment this child could express preferences that something was up. I'm talking 18 months - 2 years old, this kid is playing with dolls and trying on mom's high heels and makeup.

Back then, none of us had ever heard of a transgender person and had no idea this was even a thing, so we just assumed she was a gay boy. When she finally learned that trans people existed when she was in high school and told her mom, "Hey I'm a girl," it was like the most face-palmingly obvious thing ever. Of COURSE that's what we'd been seeing literally her entire life.

If she were growing up today, she and everyone around her would have identified her correctly at a much earlier age.