The original wearable blanket replaces loose blankets in the crib for a safer environment; the 3-way swaddle ensures your baby's best sleep and an easy transition when it's time to stop swaddling; number 1 choice of hospital nurseries to promote safe sleep | Made with 100% cotton fabric, double knit construction is soft and a little stretchy, perfect for swaddling; TOG Rating of 1.5 offering the right comfort for moderate seasons or climates, and can be layered with warmer sleepwear for cooler temperatures | Generously sized swaddle fasteners offer adjustability for a perfect fit; 3-way adjustable swaddle allows Arms-In to reduce startle reflex, One-Arm-Out for self-soothing, and Two-Arms-Out for easy transition from swaddling to Halo's SleepSack | Inverted zipper opens from the bottom for easy diaper changes without undoing the swaddle; sleeveless to reduce the risk of overheating; arm and neck openings sized for a safer fit | Available here in Small size designed for babies weighing between 13 and 18 pounds who are generally 3-6 months old and 23-26 inches long; discontinue swaddling when the baby shows signs of rolling over or breaking out of the swaddle wrap.