CHILD DEVELOPMENT
Child development refers to the biological, psychological and emotional changes that occur in human beings between birth and the end of adolescence, as the individual progress from dependency to increasing autonomy. Because these developmental changes may be strongly influenced by genetic factors and events during parental life, genetics and parental development are usually included as part of the study of child development. Related terms include development psychology, referring to development throughout the lifespan, and pediatrics, the branch of medicine relating to the care of children. Developmental change may occur as a result of genetically-controlled process known as maturation, or as a result of environmental factors and learning, but most commonly involves an interaction between the two. It may also occur as a result of human nature and our ability to learn from our environment.

There are various definitions of periods in a child's development, since each period is a continuum with individual differences regarding start and ending.

Some age-related development periods and examples of defined intervals are: newborn (ages 0–4 weeks); infant (ages 4 weeks – 1 year); toddler(ages 1–3 years); preschooler (ages 4–6 years); school-aged child (ages 6–13 years); adolescent (ages 13–20).[1] However, organizations like Zero to Three and the World Association for Infant Mental Health use the term infant as a broad category, including children from birth to age 3.

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.[2] 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. In addition there are also some theories that seek to describe a sequence of states that compose child development.
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