Books help to normalize what some would sensationalize. It helps to take the taboo away from what the mainstream calls different and makes children in less conventional families feel validated, which is so important. Children thrive the best when they feel validation.

Also, I get very uncomfortable when people begin equating trans* w/ woman hating, b/c the two are not equal. It is about the gamut of humanity, and about how a person feels the most comfortable w/ themselves, and it is not for a person outside of that particular body to judge how that person deals w/ their own body. Being FTM is no more woman hating than being a gay man. I have seen this kind of thing used to draw lines in feminist circles where they don’t need to be drawn. Kind of like dividing our own forces against ourselves if you ask me (which I know no one has). Children need to lean that our world is made up of all kind of bodies and that the gender binary is a social construct. Books like 10,000 Dresses and the ones you listed help to show that. Books w/ gay characters aren’t going to turn children gay any more than Harry Potter books are going to turn kids into wizards or Twilight is going to turn them into Vampires.