Pediatrics deals with the care of infants and children in health and illness and all aspects of child life and development relating to health, directly or indirectly. The trend in pediatrics emphasizes health and fitness, moving away from a concentration on treatment of diseases and toward prevention of disease and disability. Pediatricians have concern for total emotional and social well-being as well as physical health. Pediatricians treat children in accordance with each one's individual level of development. After medical school, three to five years of additional training is required to become a pediatrician.