The Rumparooz Newborn Cloth Diaper Cover is designed to grow with your baby with 3 adjustable rise settings that are designed to fit your preemie and newborn. Weight range of cover starts at 4 pounds and will fit up to approximately 15 pounds. Rumparooz Newborn Cloth Diaper Covers are generously sized and designed to fit over most newborn fitted or prefold diapers. Covers may be used multiple times before washing but should be placed into the laundry if it becomes soiled. Kanga Care uses a water resistant polyester TPU which is a solvent-free polyester fabric that has been laminated with a thermoplastic polyurethane using a heat bonding process, not chemicals. This process is low in toxicity and is better for the natural environment then traditional PUL.