The document provides information about typical development in babies at various ages from 2 months to 9 months. It includes milestones for social/emotional development, language/communication, cognitive development, and movement/physical development. It also suggests activities parents can do with their babies at each age to help support learning and development. Checklists are included for parents to track the milestones their baby has reached at 2, 4, 6, and 9 months.