I just started quilting my first sandwich and let my DH pick out the backing fabric since it was his blanket and he picked out baby fleece. It has actually turned out really well. I did have some slipping problems on one edge because I did not baste it well enough but was able to rip a few stitches and fix it right up. The baby fleece doesn't stretch as much as regular super fluffy fleece IMO but I haven't actually sewed with the other fleece just have lots of blankets made out of it.