The document discusses cognitive development in infancy based on Piaget's theory and the information-processing approach. According to Piaget's theory, infants progress through sensorimotor stages from birth to age 2, developing object permanence and basic symbolic thought. The information-processing approach views cognitive growth as improvements in encoding, storing, and retrieving information. Both approaches provide insights into infant cognition, though each has limitations. Language development begins with babbling and comprehending words before producing words starting around age 1.