I made terry towelling ones and overlocked the edges. I've got some the size of normal face washers (25 x 25cm I think) and some half that size (25x12). I was going to make some in other fabrics but these work well and wash up easily. My SiL has small flannelette ones (maybe 5x8). I find them ok for wee bit not large or thick enough for poo. She has also managed to get them stuck in the washing machine - they now go in a bra bag!