This book is a celebration of the emergence of knowledge in the field of pediatric hepatology and is written for primary care clinicians to help update their knowledge of the field. The current and future shortage of pediatric gastroenterologists and hepatologists necessitates steady, rejuvenated information on liver and gastrointestinal disorders for primary care clinicians as they care for children and adolescents with complex hepatologic/gastroenterologic dilemmas and disorders. In view of this shortage and the rapidly increasing knowledge in pediatric gastroenterology as well understanding indications for referral to pediatric gastroenterologists in the 21st century, au courant assiduous information aimed at primary care clinicians in these areas becomes increasingly important.