I have sewn many costumes, dress etc in the past 30 years but never a quilt. I thought I'd start with a rag quilt since I'm about to have a new grandbaby and it looks pretty easy. Well, now I'm confused about the batting between the two layers of flannel. When I sew the squares together (after I sew the X on the flannel/batting/flannel square) do I sew thru the batting in the seam or not?? My instructions are very unclear and I've tried to find information on the internet and have been unsuccessful. Thank you!!!