The absorbency does the soaking and the cover keeps everything contained! Rumparooz Cloth Diaper Covers provide the waterproof outer layer needed when using prefolds, flats or fitted cloth diapers. Simply add your favorite absorbency underneath and fasten the cover over it! 🌱Newborn: approximately 4–15 lbs. 🌻 One Size: approximately 6–40+ lbs. Whether you’re wrapping a prefold around your baby or laying absorbency inside the cover, Rumparooz makes it easy to create a flexible cloth diapering system that works for your family! #kangacare #rumparooz #clothdiaper #clothnappies