All of the following are required to renew a child development associate (cda) certificate except a. documented proof of a current red cross or other agency pediatric first aid certificate. b. documented proof of recent (within the past year) work experience with young children or families of young children (a minimum of 80 hours). c. a completed letter of recommendation form regarding the cda's competence with young children prepared by an early childhood education professional. d. a completed letter of recommendation form regarding the cda's competence with young children prepared by a parent from your center.