how many

Boxes of each size diaper did you buy? This is 3rd baby first boy and I can't remember how many boxes of each size I needed. I can't even remember if I got prepared for others or just went with the flow. But either way I want to start buying a box of diapers every pay check so I'll have some to last a while. I prob will use pampers. So how many boxes of each size do I need?