We've only got 5, so def get more than that. Thankfully they're quick drying, and having 2 in cloth means I wash every day and a half, so we can just about manage with teenyfits when we're out and fuzzi's BG and itti's at home!
We used teenyfits for quite a while until 6 months at least I think but then he was only 12lb at 6 months that said I've used OS nappies on DD from newborn we used BGs with the MF inserts and they are bulkier than easyfits, she was 7lb8 but dropped to about 7lb