Gr 2-4 A little boy doesn't want to give up his crib until he realizes all the fun he can have playing on a ``big bed,'' including picnics with stuffed animals and train rides with playmates. To his great relief, he doesn't fall out, and Grandma is impressed with his grown-up bed. The portrayal of the boy, his friends, and their activities suggest a child too old for the situation presented. Simple text and cartoon style line-and-wash illustrations are adequate, but unimpressive. Despite the book's mediocrity, it will be useful for those families facing big-bed-phobia. Heide Piehler, Shorewood Public Lib . , Wis.