I've been using prefolds/flats on my 4 month old DD and I need to buy more. Im not sure if I should stick with them or move on to pockets/AI2s? I have a few one size nappies (Happy Heiny, Haute Pocket, Cushie Tushie) and if I did buy more nappies I would be looking at one size.

Cost wise I think it would probably be cheaper to stick with prefolds/flats - can anyone give me recommendations? I am using unbleached cotton at the moment.

Thanks in advance