The original sleepsack swaddle replaces loose blankets in the crib for a safer environment;the 3-way swaddle ensures creates a womb-like feeling your baby's best sleep and an easy transition when it's time to stop swaddling, The original wearable blanket made with 100% premium cotton, double knit construction is soft and a little stretchy, perfect for swaddling;TOG Rating of 1.5,offering the right comfort, the sleeveless design of the swaddle blanket reduces the risk of overheating and can be layered with warmer sleepwear to resist cooler temperatures, Generously sized swaddle fasteners offer adjustability for a perfect fit; 3-way adjustable swaddle allows Arms-In to reduce startle reflex, Hands-to-Face for self-soothing, and 1 Or 2 Arms Out for easy transition from swaddling to sleepsack., Arm and neck openings sized for a safer fit;Generous easy-open leg sack design provides the comforting, enclosed feeling of the swaddle but without limiting leg range of motion., Available here in Medium size designed for babies weighing between 18 and 22 pounds who are generally 6-12 months old and 26-37 inches long; discontinue swaddling when the baby shows signs of rolling over or breaking out of the swaddle wrap.