"The Happiest Toddler on the Block" is a parenting book written by Dr. Harvey Karp. It offers strategies for parents to help their toddlers express emotions and communicate effectively. The book emphasizes understanding toddlers' feelings and using simple techniques to foster happiness and cooperation. Dr. Karp introduces the concept of "Toddler-ese," a way of speaking that resonates with young children. He provides practical tips for managing tantrums and promoting positive behavior, making it easier for parents to connect with their little ones. The book is part of the Happiest Baby series, which also includes guidance for newborns and infants.