Many infants and toddlers attend child day care centers while their parents are making aliving. Therefore, health promotion for these children should be done consistently in theirhomes and child day care centers. This participatory action research study was aimed toestablish and develop a health promotion model in the Small Child Study Center, Faculty ofNursing, Chiang Mai University. Data were collected by using a weighting instrument, a heightmeasurement tool, the Developmental Screening Inventory (DSI) tool, a graph of reference ofstandard weight and height, a growth and development recording form, a health status recordingform, parentûs needs for health promotion services and services satisfaction questionnaire,and staffûs child health promotion knowledge and satisfaction with services questionnaire. Theseinstruments were developed by the research team. Data were analyzed by using descriptivestatistics, t-test, and grouping of the answers.This finding revealed that fifty eight children attended the Small Child Study Center whilethe health promotion program was implemented. They were 2-36 months old. Most of themwere the first child of the family and their parents worked outside their homes. All parentsneeded health promotion services. Activities in the health promotion program included nutritionalstatus, growth and development, health assessment, dental health, injury prevention,behavioral development, infection control, healthy environments, health counselling for parents,and health manpower development. After implementing the health promotion program,children developed better growth, development, nutritional status, and dental health. Parentshad more satisfaction on the services. Personnel had more knowledge on child health promotionand were highly satisfied with services provided in this health promotion program.This study indicated that all child care centers should establish health promotion services.In addition, health promotion for children should be consistently provided by families and childday care centers.