NICU (Neonatal Intensive Care Unit) nurses have used waterbed therapy, air-filled mattresses, foam mattresses and repositioning procedures in an attempt to manage the development of DP, but these methods have had limited success. The reason these devices are not successful is because they do not provide structure or support for the soft cranium that has un-fused sutures and that have not become fixed or solidified. As a result, the soft, malleable cranium then takes the shape of the bedding or device it is placed upon, which is usually flat (including the aforementioned positioning devices).