When storing cloth diapers long term, do it right. In between kids, keep cloth diapers in appropriate storage: temperature and humidity controlled environment, in a breathable container (NOT space saver bags, plastic bags, or plastic totes- use a pillow case, cardboard box (that is not sealed shut with gobs of packing tape), or a well ventilated storage container, and take them out and wash them 2-3 times a year to keep elastics from dry rotting and to prevent damage from dust-mites.