With pul wraps you can normally use 2 a day and alternate them unless they poop in them lol , so use one , air one , use one air one - doesnt that make sense?? I would say you'd want around 6 though just to be sure , you can pick up plain white motherease ones on classifieds quite easily i think.
We didnt use cloth until 5 months and i dont think they wet as much as a newborn by this age , but even them i was recommended to have 20 nappies. I think i had 14 to start with but they were all fuzzi's so dried overnight whereas fitteds wont.
If it were me i think i would get a couple more cheapy wraps and about another dozen fitteds , again nothing fancy just tots , little lambs etc..
not sure if that helped at all hun