Thanks, everyone!
Loved the Ecc 7:8 reference, duckling. Perfect for quilting!
The batting in the baby quilts is a 5 oz. polyester. It is loosely spun together, so even tho it's thin and light, it will puff up and hold air for a warm quilt. Those quilts will make good "tummy time" on the floor, as they are nice and cushy.
I buy the batting by the roll from Marshall's Dry Goods in AR. It's much cheaper than cotton or 80/20, so that's a plus too.