Sarah,
This is something I wondered also. But figured it out easily.
I took and put flannel on the back of it, no batting.
1.right sides together,
2. sew all the way around leaving a hole to turn the quilt
3. get it nice and flat again (sew up hole) around the edges, pin, and I also pinned in the middle.
4, sew around 1/2 inch from the edge of the quilt
5. the middle of the quilt (I have a long arm) I sewed a circle right around the seams to hold the quilt and flannel together.
It is a wonderful quilt to sleep under the weight of all that fabric is a great feeling.