This document discusses principles and factors affecting child growth and development. It defines growth as a quantitative increase in size while development refers to functional and qualitative maturation. Growth and development are continuous, orderly processes that proceed in stages from head to tail and center to periphery. They are influenced by genetic, prenatal, and postnatal factors such as nutrition, environment, socioeconomic status, and hormones. The document outlines the common stages of development from neonate to adulthood.