Puff Baby Quilt Tutorial! For the quilt top I used a charm pack from Joanns that had 10 different patterns. Each pack comes with 30 squares, so I had to buy 4 packs. this makes a 36" square baby blanket. Quilt can be backed with Minky of coordinating cotton. Melissa, the squares are cotton and the backing is solid minky. The 5x5 squares came from a charm pack. The 4x4 squares I cut from a yard of cotton fabric.