This document provides an overview of several prominent theories of child development, including those related to cognitive development (Piaget, Vygotsky), language development (Vygotsky, Skinner, Chomsky), social development (Bronfenbrenner, Vygotsky), and emotional/psychological development (Erikson, Bowlby, Ainsworth). Theories discussed include stages of development, the importance of social interactions and language, and the interplay between nature and nurture in influencing a child's growth.