The Butterfly Cardi gives your baby two sleep solutions in one cleverly designed product. If you have a baby who prefers to sleep with their hands near their face for comfort, the Butterfly Cardi can be used over any arms-out swaddle or sleeping bag to support this sleep style. If you have an arms-in swaddled baby beginning to show signs of rolling, the Butterfly Cardi is designed to be worn over their sleeping bag to help them with transitioning to arms-out sleeping with minimal interruptions and maximum comfort.