I always use
Warm & Natural it is 100% cotton and very low loft. It doesn't get hot in the summer since it is cotton. It comes in natural and white depending on the color of your fabric. When in doubt always get the natural colored one. A queen size bat will do 4 baby quilts which is more economical than buying crib size. Use a 50% off coupon at Joanns and it is very inexpensive!