100% Cotton SIZE SMALL/MEDIUM: The SwaddleMe Original Swaddle in Small/Medium fits babies 0-3 months, 7-14 pounds, up to 26 inches long. EASY TO USE: The wings of the adjustable swaddle blanket wrap around baby for the perfect fit every time, creating a womb-like feeling for your little one. SECURE FIT: Hook-and-loop closures keep this baby swaddle wrap from coming loose. Slits on the back allow for use in swings and bouncers. (Do not use in infant car seats.) SOFT AND COMFORTABLE: This newborn swaddle is made out of durable natural fiber (100% cotton) and is machine washable. The snug fit helps prevent the startle reflex. STAGE 1: The SwaddleMe Original Swaddle is part of Stage 1 in the SwaddleMe Stages of Sleep, perfect for your newborn who is not yet rolling over and likes to be swaddled with their arms in. When baby starts showing signs of rolling, transition to Stage 2.