Little girls are conditioned and prepared from a very early age for an expectation that caring for babies and children will be their role. In many toy stores, you'll find every single baby doll, buggy, doll's house and toy cleaning product under a pink sign that says "GIRLS' TOYS".
This accomplishes two things: it tells little girls (and their parents, carers, and gift-buying friends and relations) that they should be interested in playing at pretending to be mommies, and that caring for babies and looking after a home is for them.
And it tells little boys (and their parents, carers, and gift-buying friends and relations) that looking after babies, children, and the home is none of their concern, that it's 'girls' stuff', and that their time would be better spent role-playing as firefighters, superheroes, or soldiers.
And then we wonder why little boys grow into men who think that childcare and domestic work isn't their concern, and little girls grow into women who accept that as the norm.
If retailers would take down the 'boys' and 'girls' signs from their toy shelves, manufacturers would stop with all of the pink and blue marketing bullshit, and parents would let children choose their own toys and role-play (many will want to model what they see at home from their parents, which is increasingly likely to be a SAHD or a relatively even split of the childcare and homemaking duties), we might have some hope that the next generation will be free of the ingrained presumptions and expectations that undermine these kinds of attempts at bringing about equality.