If that child ends up being cisgender they're going to go through a shit ton of hardships while other kids make fun of them and they won't know why. It's better to just keep the birth assigned sex marker and let your kid wear/play with whatever "gendered" stuff they like and if/when the time comes that they say they aren't their assigned gender, embrace and love them. This is putting a lot of unnecessary stress on a toddler. It's also very dangerous for medical reasons if you're ignoring your child's biological sex on papers.