I saw an article about how difficult it actually is to find clothes for babies that aren't printed with stereotyped designs for girls or boys, or made with excess decorations (I suppose that's just for girls). The author raises the question of why people seem to want this kind of thing, and suggests that it has something to do with modern testing that lets parents know the sex (shouldn't be "gender", of course) of their babies before birth. Maybe that's it, I don't know.
www.vox.com/the-highlight/2020/2/12/21078915/gender-neutral-clothing-baby-clothes-target-gap