Development of the vocabulary of children of younger preschool age forward this error screen to 172. Child development entails the biological, psychological and emotional changes that occur in human beings between birth and the end of adolescence, as the individual progresses from dependency to increasing autonomy. There are various definitions of periods in a child’s development, since each period is a continuum with individual differences regarding start and ending. Promoting child development through parental training, among other factors, promotes excellent rates of child development.
Parents play a large role in a child’s life, socialization, and development. Having multiple parents can add stability to the child’s life and therefore encourage healthy development. The optimal development of children is considered vital to society and so it is important to understand the social, cognitive, emotional, and educational development of children. Increased research and interest in this field has resulted in new theories and strategies, with specific regard to practice that promotes development within the school system. There are also some theories that seek to describe a sequence of states that compose child development. Also called “development in context” or “human ecology” theory, ecological systems theory, originally formulated by Urie Bronfenbrenner specifies four types of nested environmental systems, with bi-directional influences within and between the systems. The four systems are microsystem, mesosystem, exosystem, and macrosystem.