Child development scientific study of systematic processes of change and stability in human children. Social construction an idea that is generally accepted to be real by a particular culture or society: ex. division of the lifespan into periods of development. Raising children - provide solutions for many questions that parents are desperate to have answers to. Choosing social policies - make informed laws and policies to help all children. Understanding human nature - nature vs. nurture (ex. Infancy to toddlerhood birth 3: physical developments senses and body systems operate, brain grows, physical growth, cognitive developments ability to learn and remember, use of symbols, comprehension. Middle childhood 6 11: physical developments growth slows, athletic skills improve, good health, cognitive developments egocentrism diminishes, memory and language increase, psychosocial developments self-concept is more complex, peers assume greater importance. Physical development growth of body and brain, including biological and physiological patterns of change in sensory capacities, motor skills, and health.