Hi! I have used Minky and Quilters Flannel for backing. The Minky can be quite slippery - so you have to do a lot of pinning, but it can't be beat in the "softness" category. It is not thick at all - and you can get some really cute textures pressed into the fabric - however, it is rather expensive just to do backing. Quilters Flannel is a little heavier and finer weave than standard flannel, and it works for a quilt back really well. Be sure you wash it first in warm water & dryer so it shrinks, because it will shrink different than regular cotton. Flannel also tends to "pill" a little bit over time, but overall it works well for a baby quilt. Good luck! Brown and Pink is so cute!!! Love it!!