But first, to complete the baby blankie, I blocked it, taking care not to stretch it too much so it would keep it's shape:
After blocking, the blankie measured 24"x30". Next I pinned the blankie to a large piece of pink flannel and carefully cut out the flannel around it. With Coats and Clark pink thread, I painstakingly hand sewed the blankie to the flannel around the outer edges. I made sure to sew every loose bit of yarn onto the flannel around the edges so it wouldn't snag.
Then I pinned a pattern on the flannel side of the blankie and carefully sewed the flannel to the blankie according to the pattern I made. First I pinned about 2" in from the edges to create a box, and sewed that. Next, to make the center x pattern, I lay strips of paper down diagonally until a straight line is formed, and then stuck the strips of paper to the flannel using post-its (regular tape would fray the flannel too much when you pull it off). Then I pinned along the edge of the paper strips to create the line, removed the strips and sewed along the edge of the pins. This helps keep the blankie from sagging and keeps the flannel from separating from the knitting.