The Transitional Swaddle Sack was created by a nurse and mom of two, and it is so special it has earned a patent for its design! The Transitional Swaddle Sack is the easy way to transition baby from the swaddle, and it is designed to bridge the gap between snug swaddling and a loose-fitting sleeping sack. The Transitional Swaddle Sack is a very important innovation for babies who can roll over. The sack’s ergonomic design features a snug midsection to provide snugness to reassure and comfort baby. Our Transitional Swaddle Sack features a 2-way zipper, so diaper changes are easy. Just unzip from the foot to access the diaper. Sizes: Body weight is most important when selecting size for this garment. For proper fit do not size up. Small, 6-14 lbs, 0-3 Months Medium, 14-21 lbs, 3-6 Months Our Transitional Swaddle Sack is made from 100% stretchy, breathable, soft premium cotton knit. Designed in USA. Imported Patented