Gastroenterology and Nutrition.- Microvillus Inclusion Disease and Tufting Enteropathy.- The Spectrum of Autoimmune Enteropathy.- Congenital Problems of the Gastrointestinal Tract.- Pyloric Stenosis.- Gastrointestinal Problems of the Newborn.- Enteral Nutrition in Preterm Neonates.- Parenteral Nutrition in Premature Infants.- Infectious Esophagitis .- Eosinophilic Esophagitis.- Gastroesophageal Reflux.- Esophageal Achalasia.- Helicobacter Pylori Gastritis and Peptic Ulcer Disease.- Menetrier Disease.- Viral Diarrhea.- Bacterial Infections of the Small and Large Intestine.- Intestinal Parasites.- Persistent Diarrhea in Children in Developing Countries.- HIV and the Intestine.- The Spectrum of Functional Gastrointestinal Disorders.- Disorders of Sucking and Swallowing.- Defecation Disorders in Children: Constipation and Functional Fecal Incontinence.- Hirschsprung's Disease and Intestinal Neuronal Dysplasias.- Intestinal Pseudo-Obstruction.- Gastrointestinal and Nutritional Problems in Neurologically Impaired Children.- Cyclic Vomiting Syndrome.- Food Allergy.- Eosinophilic Gastrointestinal Disorders Beyond Eosinophilic Esophagitis.- Crohn's Disease.- Inflammatory Bowel Disease Unclassified (IBD-U)/Indeterminate Colitis.- Ulcerative Colitis.- Microscopic Colitis.- Vasculitides Including Henoch-Schönlein Purpura.- Lymphonodular Hyperplasia.- Acute Pancreatitis.- Chronic and Hereditary Pancreatitis.- Congenital Disorders of Intestinal Electrolyte Transport.- Congenital Disorders of Lipid Transport.- Immunodeficiency Disorders Resulting in Malabsorption.- Exocrine Pancreatic Insufficiency.- Celiac Disease.- Cystic Fibrosis.- Small Intestinal Bacterial Overgrowth.- Short Bowel Syndrome.- Malnutrition.- Enteral Nutrition.- Parenteral Nutrition in Infants and Children.- Intussusception.- Meckel's Diverticulum.- Acute Appendicitis.- Gastrointestinal Vascular Anomalies.- Polyps and Other Tumors of the Gastrointestinal Tract.- Fecal Microbiota Transplantation in Children.- Prebiotics in pediatrics.- Probiotics in pediatric gastroenterology.- Postobiotics in pediatrics.- Hepatology.- Normal Liver Anatomy and Introduction to Liver Histology.- Diagnostic Procedures in Pediatric Hepatology.- Infantile Cholestasis: Approach and Diagnostic Algorithm.- Biliary Atresia and Choledochal Malformations.- Congenital Hepatic Fibrosis, Caroli's Disease and Other Fibrocystic Liver Diseases.- Familial Intrahepatic Cholestasis.- Alagille Syndrome.- Chronic Viral Hepatitis B and C.- Bacterial, Fungal and Parasitic Infections of the Liver.- Liver Disease in Primary Immunodeficiencies.- Autoimmune Liver Disease.- Liver-based Inherited Metabolic Disorders.- Wilson's Disease.- Nonalcoholic Fatty Liver Disease.- Vascular Disorders of the Liver.- Portal Hypertension in Children.- Liver Tumors in Children.- Acute Liver Failure in Children.- Complications of Cirrhosis in Children.- Nutritional Management of Children with Liver Disease.- Pediatric Liver Transplantation.- Growing up with Liver Disease.- New Horizons in Pediatric Hepatology: A Glimpse of the Future.