The Consumer Product Safety Commission warns parents not to let a baby sleep in rockers, pillows, car seats, or any other product that holds an infant at an incline greater than ten degrees. Researchers report that lying on an incline can activate a baby’s stomach muscles, making it easier to turn over, even if they’ve never done so before. Once a baby is on their stomach, the angle can make it tough for them to get out of that position, leading to a greater risk of suffocation. Consumer Product Safety Commission, November 2019