PATRICELLI, Leslie . No No Yes Yes . ISBN 978-0-7636-3244-1 . LC 2007930638. ea vol: illus. by author. unpaged. Candlewick . 2008. BD $6.99. PreS Two appealing concept books. In Baby Happy Baby Sad , the familiar diaper-clad youngster moves through opposing emotions on each spread, happy while holding a balloon, but sad when it flies away; happy running naked, but sad bundled in a snowsuit. In No No Yes Yes , the child encounters familiar toddler activities both the right way ("Yes Yes," which shows baby eating a banana and the dog eating from its bowl) and the wrong way ("No No," showing baby sampling the dog food). The delightful and amusing acrylic illustrations tell the story in both titles. Baby's activities will be familiar to toddlers, who can actually "read" the pictures and chime in themselves. The concepts ring as clear as a bell even for the youngest of listeners. Richelle Roth, Wilmington Public Library, OH