"A picture book about baby Billy, who is born with a mustache, and his parents, who must figure our if it's a Good-Guy mustache, or a Bad-Guy mustache"--Provided by publisher. Interest Level: K-3 Reading Level: 2.6 ATOS Book Level: 2.5 AR Interest Level: LG AR Points: .5 AR Quiz: 158454EN Lexile Measure: 380 Lexile Code: AD (Adult Directed).