5512559 Size: For 5-13 pounds Features: -Baby swaddle.-Material: 92pct Cotton / 8pct Spandex.-Suitable for 5-13 pounds (birth-3 months) and 14-19 pounds (3-6 months).-Safe and simple to use.-Easy in/out zipper.-Allows baby natural movement while preventing the startle reflex.-prevents unraveled blankets from riding up and covering the airway.-Arms open to transition baby to arms free sleep when the time arises.-Lightweight and breathable.-Back sleeping is required when swaddling a baby.