Kyle and his Extra X and Y is a children's book for kids with 48, XXYY. This book helps children and adolescents with XXYY understand their condition. The story follows Kyle, a young boy with XXYY, through his busy day as he attends school, goes to golf practice and has a doctor's appointment. The story explores the genetics of XXYY and addresses social, academic and medical aspects of this condition in an age-appropriate, fun way. Though Kyle's condition presents him with many challenges throughout the story, he is able to work through each challenge in his own way. Boys with XXYY will identify with and learn from Kyle as they read this book.