This article focuses on the early childhood years, from 2 to 5 years of age. There are over 12 million children in this age range in the United States, many of whom face a number of challenges. In this article we discuss cognitive, language, motor, and social development, including relevant theories and major language and motor developmental milestones. We also discuss several family and environmental factors that influence development, including attachment, parenting, working parents, and poverty.
Donna Harrington and Karen Castellanos-Brown
This article begins with an overview of biological development based upon empirical research. The main focus of the article is the presentation of the major theoretical frameworks that have been employed to explain the processes involved in the psychological, cognitive, moral, social, and sexual development of the adolescent and empirical research findings where appropriate.