I fold the backing in half before I tape it down to the floor, then fold the batting and top in half and align them with the the backing so all three parts are centered. I sandwhich all three layers using Pinmoore's I really like them and it seams to go quicker for me then using the pins. Also I make sure the backing is 3" larger than the batting and top, and I mark my top before I sandwhich the quilt. Have fun working on your crib quilts.