365 Activities You and Your Toddler Will Love has four age ranges: 12 to 18 months, 18 to 24 months, 24 to 30 months, and 30 to 36 months. Kid-tested activities, ranging from catchy tunes to interactive games, channel a toddler's natural curiosity and energy into play that builds developmental skills, such as balance, problem solving and language. Author Nancy W. Hall is a media consultant for the Center in Child Development and Social Policy at Yale University, where she has earned her master's degree in child development and is completing her doctoral work. A former contributing editor to Child magazine and to Parents magazine, Hall has written extensively about the importance of play in children's development.