Okay so my son had his 4 month checkup today. All is good except his head is just a little flat on the back. Which is pretty much impossible to avoid since they're suppose to sleep on their backs. Anyway... Dr. said we should try and put him on his side at night with a rolled up blanket or towel behind his back so he'll stay in that position. Has anyone done this or tried it? I'm a little nervous having anything in the crib with him...even that. Though I'm sure he'll be fine. But did this method work for anyone? Any other tips to help with his flat head?