I've used all kinds of batting, until I found my favorite, Quilters Dream Blend. It is 70% cotton and 30% poly. Little more loft than Warm and White--nice for kid's quilts. I can't find in locally, but when it's on sale I buy a big package here:
http://www.fabricdepot.com/index.php...ge&pageid=7097
Sign up for their newsletter and they will email you whenever it is on sale--sometimes 40% off.