Oh FFS. No, in fact, statistically, boys and girls are similar, or often boys are smaller, at this age.
Of course I can choose what to dress her in. and I DID. But it's very difficult to avoid the many many mesages that girls clothes must be skimpier and tighter when even as babies it's out there with baggy lose clothing as standard for boys and tight, short clothes is standard for girls.
So I find it so frustrating when parents are horrified that their teenage girls are wearing tight clothing considering that practically since the day they're born, parents put girls in tight clothing. All the pearl clutching and hand wringing and "why do they do this".
It's not sexualised, obviously, but the basic premise is there. Just like from the day they are born we don't put boys in skirts/dresses and therefore, the vast bulk of boys as teenagers do not, in fact, wear skirts or dresses.
And there are always people bleating about "leggings are practical" or "well then choose to put your DD in something else" but I dare you to start paying attention and you'll see - at the park, at sports groups, at nursery - the girls are wearing leggings, maybe dresses, short shorts and the boys aren't.