Should have added.... I always cut the batting at least 1.5 inches smaller than the large flannel square so that it never shows in the 1 inch seam allowance. As far as the center stitching I only do it if the square is 5-6 inches or larger. I find with the good flannels of the top mfgs., the seam allowances, after clipping and washing, are nice and fluffy too and get better with each laundering.