This is a state-of-the-art review of sonography of the gastrointestinal tract in fetuses, neonates and children. An introductory chapter compares sonography and magnetic resonance imaging of the fetal gastrointestinal tract. Coverage focuses on technique, pitfalls and findings in applications including antropyloric diseases, bowel obstruction, bowel wall thickening, colitis, appendicitis, intussusception, abdominal wall and umbilical abnormalities, intraperitoneal tumors and trauma, with high-quality illustrations. Includes a quiz based on 15 case reports.