The HALO SleepSack easy transition wearable blanket helps to ensure an easy transition when it's time to stop swaddling your little one. Perfect for babies who no longer like to be swaddled, but still need a bit of security around their arms to reduce the startle reflex. Designed with lightly quilted 100% cotton stretch and sleeves to help give your little one a snug fit without overheating Baby's arms remain free, so it's safe for little ones to roll Available here in Small size, for babies who weigh 13-20 pounds, and are generally 23-26 inches long.