Ergonomically shaped design allows a more natural approach to swaddling. Eases transition from Womb to World. Easy to use- 1 step swaddle, no origami required., Will not unravel as a blanket can. Encourages back sleeping (babies are more likely to maintain on their backs in swaddles). Gently cocoons baby's arms & keeps hands away from face., Promotes self soothing by allowing baby to hold/touch his hands inside the swaddle. Hip & shoulder friendly design. Stretchy but snug swaddling fabric simulates the feeling of being held, touched & cuddled., Narrowed waistline gently compresses the tummy, providing tummy comfort. Fabric snuggles & moves "with" baby, mimicking the womb-like environment. Allows natural arm & leg movement during swaddling while asleep/less restriction., Lightweight & breathable swaddling fabric helps to promote airflow. Two-way zipper allows for easy diaper changes at night. Seamless interior provides more safety & comfort. Can be used in strollers / swings in arms out position.