This swaddle for newborns is made with ultra soft cotton and it is lightweight and highly breathable which makes it a highly raved newborn swaddle sack for all seasons. Our two way zipper swaddle wrap is easy to change the diaper without unwrapping the swaddle sack while your baby is asleep and the zipper has an auto lock function so even if the mother forgets to pull it baby feet cannot be hurt. Our baby swaddle sack provides ergonomic hip support for an infant first months of growth allowing the infants to stay calm and sleep more peacefully. This newborn swaddle sack with the hook and loop allows you to adjust tightness wrapping around baby for a perfect fit in every sleep stage from newborn with the arms in to sleeping with both arms out. Our newborn swaddle creates a womb like feeling and helps soothe and calm the baby and it is certified to be safe for use.