It is a great pity that children are not allowed to express themselves without gender stereotyping.
Alexa, you say you know nothing about trans issues but you have hit the nail on the head concerning children.
There are numerous youtube videos of happy 'trans' kids and their happy parents. All the ones that I have seen are based on stereotypes. Parents say, in the videos, that they shouted at their children and/or made them wear certain clothes, have their hair short or long, play with certain toys.
Then the child's statement of being the opposite sex was accepted, and all was wonderful!
The recent TV play 'Butterfly', which claimed to show a trans child, in fact showed a dysfunctional family & society who couldn't simply accept a boy as he wanted to be.