The Transitional Swaddle Sack is designed to bridge the gap from swaddling to sleeping sack. Features Little Sleeves with a Big Purpose. When parents close the mitten cuffs on the 1/2-length sleeves, the uniquely-shaped sleeves will provide partial suppression of the Moro (Startle) Reflex, and if baby rolls over on to tummy, baby can use their arms to lift upper body and reposition head to get access to air, making the Transitional Swaddle Sack a safer sleep solution. When baby is ready to transition from a swaddle, but not ready for a sleeveless wearable blanket, the Transitional Swaddle Sack is a great option to (1) keep baby snug and warm, (2) allow baby the use of his or her arms, and (3) allow baby to self-soothe by sucking on his or her hands. Foldover mitten cuffs may be worn open or closed, when open, baby can self-soothe by sucking on hands, and when closed, protects baby from facial scratches. The lower section is less spacious than a typical sleeping sack, and the Transitional Swaddle Sack provides some suppression of the Startle Reflex for the legs. The Hip Healthy design complies with the International Hip Dysplasia Institute guidelines and allows babys knees and hips to flex. The 2-way zipper has two zipper pulls one at the neckline and one at the foot of the sack. The zipper zips down from the top to make it easy to place baby in the sack and zips up from the bottom to make it easy to check babys diaper. The award-winning and patented design delivers better sleep and safer sleep for baby and you.