I know lots of people are talking about ironing vs pressing and the distortion that can happen, but I've had shrinkage happen with steam. I learned my lesson the hard way when binding and attaching a hanging sleeve on a customer quilt. The customer had given me a very small piece of fabric to use for the sleeve. I cut it, then pressed it with steam. And it shrunk so much I was not comfortable using it for the sleeve. So I steam-pressed the rest of the fabric and crossed my fingers that there would be enough left to cut a second sleeve. (I was lucky; there was.)