Diaper sizes

What size diaper is your little one wearing at 4 months? Mine will be 4 months in a week and he is still in size 1. I’m wondering if I should start moving him up a size. I just have soooo many size one diapers I got for my baby shower I wish I could use them all lol. I haven’t had any issues with any except for pampers brand the baby dry ones. I hate those