text: First off, my son has been using this pillow for almost two months now. I purchased it for his very flat head in the back. I haven't noticed his back of head getting any rounder, but for the first few weeks, I noticed that he was losing a lot of hair in the back and saw the hair on the pillow. My son is 6 months and and lots and lots of hair, so it was very noticeable. I wanted him to continue using it, so I put a small pillow case on it, which has helped. His hair is growing back now and he's able to continue sleeping on it. He doesn't roll yet, so he stays in place all night.