I used to make quilts for premies, and the batting would make the quilt too thick for small babies. What I discovered worked was woven blankets. I would purchase full sized blankets at a local thrift store, take them home and wash them in hot water and arm and hammer detergeant. Then I would cut the blanket to be my "batting" between the layers of the quilt. When the quilt was finished, I would wash the entire thing again in pure baking soda and dry it with no dryer sheets and seal it in gallon zipper bags to be mailed to hospital NICU's.