The Rumparooz Cloth Diaper Cover is designed to grow with your baby by featuring 2 sizes that fit your baby from newborn all the way through potty training. The weight range for the newborn cover starts at a small 4 pounds and will fit up to approximately 15 pounds. The weight range for the one size cover starts at 6 pounds and will fit up to approximately 35 pounds. This allows you to adjust the diaper to the proper size all while reducing the need to purchase various sized diapers making this diapering option one of Kanga Care\'s most affordable option. The Rumparooz One Size Cover is designed to fit over any type of diapering system that requires a waterproof cover such as Kanga Care Ecoposh Cloth Diapers, Kanga Care Prefolds, or Kanga Care Flats. The Rumparooz One Size Cover may be wiped dry between uses and used multiple times until being placed into the laundry at the end of the day or when becoming soiled. The Rumparooz One Size Cloth Diaper Covers are made of waterproof polyester TPU (thermoplastic polyurethane) that comes in a variety of fun colors and fashionable prints.