When her mother has a new baby, Elizabeti is given charge of her younger brother and finds it more difficult to take care of him than it was to care for her rock doll.
Records the thoughts of over fifty children between the ages of two and six on such topics as being born, the best part about being little, and growing up.
Russell decides to stay home from nursery school and be a baby just like his new sister, but he soon discovers that being treated like a baby when you are a big boy is no fun at all.