I agree with Fran.. if it's really a fun quilt or a child's play, nap, carry, car seat quilt.. muslin just continues to get softer and softer each time it's washed. My two grand daughters, 23 and 25 have every quilt that I ever made them, all with muslin backing. Didn't know what I was doing and couldn't afford to much of anything at the time.. and these quilts are actually still being used to day (surprising the heck out my, not one seam or row ever came close and most were blocked up to 4 different sides... but they are soft and comfy.. so I still carry a nice muslin on a bolt (half now) to use for backings.