Background: Childhood infectious illness mainly diarrheal diseases, febrile illnesses, and acute respiratory tract infection remains the leading cause of morbidity and mortality among children below five years. Delay and inappropriate healthcare-seeking behavior of caregivers were the major reason for under-five child death in developing countries including Ethiopia. According to WHO, a timely healthcare-seeking practice can effectively save the lives of children by 20%, particularly from ARIs, and significantly minimize morbidities. Therefore, the aim of this study was to assess the magnitude of common childhood illness, healthcare-seeking behavior, and associated factors in Efratana Gidim District,