I recently came upon a fantastic book, "The Truth About Tummy Time", by Stephanie Pruitt. I've written a review of that book on this blog. Mrs. Pruitt also has a blog---which I HIGHLY recommend you follow. She is GREAT at providing more research data and progress at making this message available to new parents. I was privileged to write a guest post for her blog, and you can read it here. While you're reading my post, don't forget to "follow" the "About Tummy Time" blog!