I do them in two layers because they go to a hospital in a needy area. Many of the mothers have nothing for their babies to go home in. The two layers makes them nice and warm. I use 2 different fabrics so they can be reversed. I stitch them right sides together leaving an opening for turning. (I make round the corners.) After turning I do a zig zag all around the edges and then I wash them. No problem with them puckering or getting funny. I make them width of fabric x about 45 so they are actually rectangles. It's just easier to cut that way - less measuring and the baby can keep using the blanket long after infancy. They are long enough to be folded in half for extra warmth.