My first rag quilt was made with cotton & 2 layers of flannel. Unfortunately I made the center flannel (my batting) the same size as the rest and started sewing them together. Well, it was too thick, so I had to rip out seams, and then go back and cut the center block smaller. I used a Sizzix die cutter & it cut the fringe which made it really fast and my 3 pieces were already stuck together. My next ones I use a smaller square in the center. I had read that flannel will stick together without sewing it in, which I don't do. So far, I haven't had any problems when washed, but I've give these away as baby quilts, so if they have fallen apart, I haven't been told.