This was posted on another thread but I think it's so powerful it's worthy of its own thread.
www.transgendertrend.com/childhood-social-transition/
Some significant paragraphs as follows:
Joseph has a choice and neither of his options are good. Either he pretends there’s nothing different even though he can see there is in the boys’ toilet every day, or he gets increasingly distressed about the fact that everyone is telling him he is a boy, he lives in the world as a boy – but he doesn’t actually have the body of a boy. Usually this is too much for him to deal with and so he blocks it out. He disconnects from his body.
A childhood is not reversible. What we grow up being told in our childhood matters for our whole lives. It forms part of how we understand ourselves and our place in the world. A child who grows up being told they are a boy whilst knowing they are a girl will only have that experience. They can’t go back and do it again.
Social transition isn’t reversible, because what we tell our children for years can’t be reversed. When we disconnect them from their biological sex, we set up patterns of denial and secrets. We set them up to hate their bodies at puberty, to beg for blockers and binders, because for years we told them they could change sex, and they believed us.