How to return a monster

If your grown-ups bring home a small monster, er, baby, don't panic. Just send it back! In this . . . book about sibling relationships, a girl can't believe it when her parents bring home a fussy, stinky, attention-stealing monster. She hatches a plan to send it back to where it came from, with hilarious results . . . and along the way, she learns that maybe monsters--and siblings--aren't so bad after all.