The document discusses the development of emotional regulation in children from infancy through toddlerhood. It notes that temperament, behaviors, and attitudes developed during this time often carry through life. Studying emotional regulation in infants and toddlers requires considering factors like early brain development, temperament, and social development through peer relationships. Emotional regulation involves controlling emotional behaviors, evaluating feelings, and modifying responses based on purpose and situation. It is a unique, changing process for each individual.