I'd not put buttons it if it's to be used for a baby - chocking hazard. I made several tree skirt eons ago using this method with triangles. After the biscuits are made, right sides together with the backing, sew around, leave an opening and turn and stitch the opening closed. And do not stuff too full because it really is hard to sew pieces together. (ask me how I know this - and it was just last fall!)