Boppy's patented Noggin Nest head support pillow which raises your baby's head so that it isn't laying flat against a hard surface, thus preventing Flat Head Syndrome. Flat Head Syndrome is a condition where the back of a baby's head becomes flattened due to the pressure of sleeping on the back,The cut-out hole relieves pressure from the back of your baby's head, helping to maintain its roundness. Generous side padding provides comfort while luxurious fabric comforts your baby all around.