This document discusses the differences between growth and development. Growth refers to a quantitative increase in size through cell multiplication and tissue growth. It is assessed through physical anthropometry, tissue growth, bone age, and dental age. Development refers to qualitative functional and physiological maturation and includes psychological, emotional, and social changes. It is assessed through milestones in gross motor skills, fine motor skills, personal and social skills, language, and vision/hearing at different ages from infancy to adolescence. Healthy development in all domains should be monitored by screening at well visits. The document also outlines different age periods from infancy to adolescence.