I will be using prefolds and covers...I picked up 2 used nb size covers yesterday as they were a GREAT deal. Do you think I need more of this size? Or are two plenty given that I don't know what sized baby this will be?
Six newborn covers worked well for me with both kids; the first was 8 pounds, 5 oz, the other 9 pounds, 12 oz. In theory small covers would have worked for both of them, but I'm really glad I had newborn covers -- mostly because it's hard enough to keep the diaper away from the umbilical cord stump with newborn covers!
I had four, and six size smalls in reserve (and six of any PUL cover is all I've ever needed). That was plenty for us. Sometimes I had to use a small one, because we we'ren't so good at snappiing and poo escaped a lot.