the understanding of health concerns related to children ,it examines the children's state of  wellness and illness from birth to , adolescence , it takes into consideration  the congenital ,hereditary, and  acquired health problems .This theoretical component focuses on disease prevention , health promotion ,maintenance ,restoration and rehabilitation of sick children ,with the integration of nursing process within a family centered care approach at primary, secondary ,and tertiary levels will be the guidelines for the application of theoretical component into the clinical practice