I read somewhere that it is better to use cotton batting in baby quilts because it is safer. A quilt with poly batting was hanging in a quilt show when the power went out. It just so happens that it was hanging in front of an emergency light and a hole was burned in the quilt. The article said had it been a cotton batting the damages would have been less serious.
I always use W&N in baby quilts. I used wool in a hand quilted quilt & thought it was easier than W&N for hand quilting. I use W&N for machine quilting on my longarm.
I like buying it by the roll & cutting what I need for each project.