Bad Baby — Ross MacDonald

Jack was having another perfect day. In fact, you could say that his whole life was perfect, except that he wanted someone to share it with. That someone arrives in the form of a new baby sister who keeps growing...and growing...until she's about ten stories tall, wreaking havoc with every step she takes. Of course, Jack gets the blame. Full of the sly, raucous humor that marked Ross MacDonald's previous books, this is the ultimate book about sibling rivalry, and one that will soon have readers young and old guffawing in recognition.