Baby clothe sizes

Ally

I’m ordering a onesie and it’s 35$ plus tax which I find is super insane for a single onesie, but it’s the one gift my daughter picked for the newborn, my question is what size should I order it in?! 0-3 months or 3-6 months. I can’t remember how long my daughter was in 0-3 month clothing and it’s so expensive for that to not get much use from lol so what size do you ladies suggest i order