This document summarizes key concepts in child psychology from the theories of Jean Piaget and attachment. It discusses Piaget's ideas of schemas and object permanence. It also outlines Piaget's stages of cognitive development and introduces concepts like conservation, egocentrism, and representational thought. The document then discusses imprinting and critical periods in animal development as well as attachment, stranger anxiety, and separation anxiety in human children. It concludes by describing the different types of attachment styles in children.