Swaddling has been proven to help babies sleep better, longer, and safer. The woombie swaddle has received over 15 awards with its innovative design and has been nominated as "moms favorite swaddle" for effectiveness and ease of use. Appreciated by moms and little ones alike, our swaddles have seamless interiors forfort and 2-way zippers that allow for quick diaper changes. They also feature special, multi-dimensional stretch mesh fabric, which allows them to snuggle and move with the baby while remaining cool. This recreatesfortable womb-like environment during the summer months and simulates the feeling of being held, touched, and cuddled. Woombie sizes: preemie: 16-17 inches, 3-6 lbs. Newborn: 20-22 inches, 5-13 lbs. Big baby: 24-26 inches, 14-19 lbs. Mega: 27-29 inches, 20-25 lbs.