The document discusses child development and the factors that influence it. It defines child development and outlines its key areas including cognition, social interaction, speech and language, physical skills, and sensory awareness. It then explains some common problems in child development such as receptive language disorder, expressive language disorder, speech production delays, cognitive delays, and emotional or behavioral delays. Finally, it discusses the major factors that influence child development, including heredity, environment, sex, exercise, hormones, nutrition, family influences, geographical factors, socioeconomic status, and learning/reinforcement.