Diapers... ftm help please

Jessica • Rainbow mom/ baby boy ruva

So I am in the progess of getting a list of what we have and dont have as a first time mom I am confused about the diaper situation.

As of now this is what we have in a few different brands

New born -63

Size 1 (8-14lbs) over 675

Size 2 (12-18lbs) 232

I seem to have a lot of size 1 and not sure if we will use them all before getting to size 2 with no gift receipts can you exchange them if they are unopened?