Based on the size of the box Mom brought, I tore 7" wide strips of flannel from the full size fitted sheet I'd bought on clearance and stacked them all together.
Mom layered two layers of flannel and one layer of fleece together. She traced around a CD and cut the circles out of all three layers. She then used the serger around the edge to hold them all together. I was appreciative for this post from Passionate Homemaking in telling how to make them.
In honor of baby's birthday tomorrow I've got a post lined up of the (finally) finished nursery and we can hopefully get a picture up of the baby itself on Thursday!