Dr. Harvey Karp is the pediatrician whose 5 S's started the swaddling revolution. He designed Sleepea's every detail with baby safety-and parent sanity-in mind. Made from 100% Organic Cotton, this ultra-soft and breathable swaddle helps babies be happier and sleep longer. We've thought of it all! A unique double-zip allows for easy middle-of-the-night diaper changes. An inner arm wrap means that even the trickiest of Houdini's can't sneak out an arm in the middle of the night, plus our special Velcro is designed to be extra quiet. Open-weave mesh ventilation at the legs and shoulders reduces the risk of overheating and Sleepea's shape is healthy for hip position and development.