The Too Smart Cover 2.0 fits most babies 10-35 lbs. This waterproof diaper cover features a soft binding around the legs that encases the elastic to provide a snug yet gentle fit. The interior of the cover has a front and back yoke to help hold inserts in place and help prevent leaks. The cover features four rise settings and 10 sets of waist snaps, making it is easy to get a perfect fit. This cover fits perfectly over any absorbent option you choose to pair with it. We do recommend purchasing 3 inserts, prefolds or flats per cover purchased. The cover does not need to be washed after each change, only when soiled or every 24 hours. This cover does require an absorbent insert. Inserts are not included.