I've made flannel quilts with good quality Moda flannel that didn't shrink much, and other quilts with some coarser Joann's flannel that shrunk a LOT. So, IMO, it depends on the quality of the flannel.

Mine didn't shrink that I noticed.

Mine didn't shrink much.

I had a floor length nightgown I made shrink to just below my knee. Good thing it was a roomy pattern.

Fabric shrinks differently when washed by itself and when washed after being quilted to a batt. When washed by itself, some flannels shrink a *lot*! These same flannels, after being quilted to a batt, will shrink only as much as the batting allows. That's why flannel shrinkage becomes pretty much a non-issue when making rag quilts.

I'm making one right now. Have all the squares done and ready to sew together. I'm already fed up with it because when I start sewing the squares together my fabric doesn't seem to want to feed through. I am using a walking foot but that doesn't seem to help. Am I doing something wrong?

I found that if you decrease the upper tension on the sewing machine (like you do when quilting), helps.