Newborn babies are at risk of developing flat areas on their head, this is due to sleeping on a flat hard surface hence their weight is not being evenly distributed. Within the Natures Nest your baby will sleep in a slightly upright position distributing babies head weight more evenly to the rest of the body, reducing the problems of  Flat Head. Although this is seen to be purely cosmetic their has been growing evidence that it can lead to problems with chewing and visual difficulties.