A Baby Sister for Frances - Russell Hoban

When a baby sister arrives, Frances the badger finds a charming way to prove her own importance. Three-color illustrations. Frances has a new baby sister . . . and she's not happy about it. With the new addition to the family, no one pays much attention to Frances anymore. At least that's the way it seems to her. So Frances decides to run away. Not too far, though--just far enough so she can hear how much she'll be missed, even by baby Gloria