Sylvester and the Magic Pebble by William Steig

[Little Simon] The charming Caldecott Medal–winning story about a magic pebble that makes wishes come true is now available as an adorable Classic Board Book! When Sylvester finds a magic pebble that will grant any wish, he can’t believe his luck! But after an unexpected scare on the way home, Sylvester makes a wish that has big repercussions.