The Bum Thumb: Book 8 of the Peter Carrot Tales; Peter is trying to quit sucking his thumb so he can prove he is a big boy.

The Bum Thumb is the 8th book in The Peter Carrot Tales series. Peter wants to be a big boy but he still sucks his thumb. His mother says she will get him a big boy bat and mitt of his own if he can stop sucking his thumb for a week. He tries really hard but needs some help.