Dear Mothercare: SUPERMAN’S COSTUME IS NOT PINK.
Given that Superman doesn’t actually exist, I reckon anybody can pretend to be Superman with as much credibility as anybody else. (Besides, these outfits are aimed at babies. Babies are not going to be flying around saving the world; they’re not even going to be running around going “neowwww” and jumping off tables pretending to be Superman. They’re going to be lying around crying and dribbling, occasionally pooing in their pants. I don’t think even Lex Luthor ever reduced Superman to that state.) However, he’s a well-known fictional character with a clearly-recognisable, iconic costume. Even if for some ridiculous reason you were convinced that girls couldn’t possibly dress as Superman (even to the extent of wearing a Superman babygro, which is hardly an accurate costume to start with) perhaps you could have given the girls a recognisable superheroine costume of their own, like, I dunno, Supergirl? Wonder Woman? Catwoman? She-Ra? I’m not saying any of them are great feminist icons (a Mary Wollstonecraft costume babygro will be available soon from all right-on baby clothes outlets), I know they’re deeply problematic in themselves; but at least they’re actual superhero characters with their own costume and their own story.
A rubbish monochrome pink-on-pink version of Superman’s costume is neither one thing nor the other; it’s a lazy way of making a “girls’ version” of something which is perceived as being “for boys”, and that’s starting from so many flawed assumptions that I don’t know where to start. Babies may seem quite alien in lots of ways, but unlike Superman, girls aren’t actually from a different planet.