The Noggin Nest Head Support, with a unique patented cut-out design, is the only head support to help guard against “Flat Head Syndrome.” This necessary cushion works by slightly raising baby’s head so that it isn’t lying flat against a hard surface. Use the Boppy Noggin Nest head support in baby’s bouncer, swing or stroller. Specifications: Patented design includes a cut out hole to relieve pressure from the back of the baby’s head, helping to maintain the roundness of his head Generous side padding provides comfort