A fitted nappy is the absorbent part of a nappy system, usually with snaps (little buttons) or velcro to make it do up easily without having to fold it or use pins to hold it. You will need to put a cover over this type of nappy, and sometimes a liner. This type of nappy comes in One Size Fits All versions and Sized versions. Please see our articles section to find out whether this option is the best one for you and what the pro's and con's of sized versus one size nappies are.