Chances are that baby may not be in the bed too much at first, lol. I think the books recommend 3 sheets & 2 protector pads. I preferred to have 5 sheets & 2 protector pads cause those first couple of months are busy enough with a messed up sleep schedule, changing diapers, & keeping up on bottles. Blankets.... I went through them like crazy the first 3 or 4 months. You end up with formula or breastmilk on them, leak through from diapers, spit up & sometimes even your own food, lol. I think by the time mine was 3 months old I had gathered at least 20 blankets! I started out with too much of some stuff though & not enough of others. I would say your best bet is if you buy more of anything just save the receipts & keep the items in the package. That way you have them if you need them but if you don't need them you can always return them. :) Good luck Momma, motherhood is a blast!