Big Mouth Elizabeth (A Is for Elizabeth, Bk.2)

Second-grader Elizabeth longs to be a member of the Big Mouth Club, which is made up of kids who have lost at least one baby tooth. Elizabeth is WAY behind on losing her baby teeth, and so is Cali, a quiet girl who is also left out of the Big Mouth Club. Elizabeth thinks Cali is so much more babyish than she is - in fact, Elizabeth SHOULD be in the Big Mouth Club because she's NOT babyish. But when she understands how bad it feels to be left out, Elizabeth's attitude shifts.