Re: How many diapers do newborns use per day??
When DS was born I changed him every time he pooped which was almost every 2hrs (when I breastfed). So that's about 8 diapers between 8am-12am. Add another 4 for good measure, b/c half the time when you change them, 15min they poop some more. Also you may have to change them once in the middle of the night, depanding how sensitive they are. Some will cry even if their diaper is a little bit wet, others could care less. So you're looking at about 120 diapers just in the first 10 days, easy.
You can stock up on size one or two if they have good deals, b/c they will use them for couple of months each, at least. But only buy one box newborn at a time. Babies grow soo fast. I usually have one extra box waiting (144 diapers). DS grew out of newborn size at 3wks, and also after 1-2 mo their pooping slows down.
Hope this helps.