I had a big baby (10.7) and didn't even use the newborns...we skipped right up to size 1. I don't know how big your baby is, but I wouldn't get too many at first. Maybe one or two packs (the hospital will send you home with some too). You can always send someone out to the store for more.
I went through TONS, at least 3 big boxes. She peed and poo'd like crazy, but I think the mound of dirty diapers was mostly due to my new mother paranoia against leaving her in a dirty diaper for even a second. I changed those suckers as soon as the line turned green. Now I realize that I definitely don't have to do that and go through maybe only 1/5th as many.
Re: how many newborn diapers do I need?
The Blog