While I am totally for all toys being for all children, and totally accept that social conditioning contributes to what children are expected to play with and therefore the sense from a very young age that certain toys are for boys or girls, I do think there is some innate nature at play too.
I had two girls, my house was full of dolls and fairies and pink stuff. (i was a lot less aware then of trying not to have gendered stuff). My son came along into this house full of "female" toys and from the moment he could choose, made a beeline for anything with wheels. As a result we bought him more things with wheels. Over the years he has never been interested in dolls or small world play, despite it being all around him, and nobody ever telling him not to play with it. Whereas that is all my daughter was ever interested in. Even when she was obsessed with Thomas the tank engine for a while, she played with the trains like people and made them talk to each other. I do think there are some innate characteristics that tend to be more prominent in one or other sex, not that that means a child is wrong, bad, or trans if they don't fit the stereotypes. But stereotypes are based in reality and females are generally biologically conditioned to want to look after the young of a species. It's how species survive, and humans are only animals really.