All of the one size cloth diapers listed below are "one size fits most" meaning they will fit most babies from birth through potty training (about 8 pounds to 35 pounds). Some fit smaller or more generously.
Benefits of One Size diapers:
Fit most kids from birth to potty, so only one set of diapers to buy
Works great for diapering more than one child; simply set the size to fit the child you're diapering
Helps keep the initial costs for starting cloth diapers lower