The batting is not the only factor when dealing with shrinking. The fabrics and cotton thread can often shrink some too. You can preshrink your batting if you want to go through the process but your cotton fabrics might still shrink just as much. When I’m making a quilt I really don’t want to shrink much I read the packages and choose one that states a minimum amount of shrinkage or none and make sure I’ve prewashed my fabrics with hot water too. It’s the whole * package * that determines the outcome. I’ve been quilting for something like 44 years, I’ve never preshrunk a batting.