Spurious Poor posture Obesity Pulmonary hyperinflation Lordotic posture of childhood Abdominal muscle weakness/hypotonia Bowel distension Aerophagia Anxiety Postprandial Post–positive-pressure ventilation with bag-valve-mask device Tracheoesophageal fistula Intestinal obstruction (mechanical) Volvulus Incarcerated hernia Intussusception Adhesive bands Duplications and other masses Meconium ileus Ileus Toxic megacolon Food protein–induced enterocolitis syndrome (FPIES) Infection Abscess Appendicitis Peritonitis Botulism Gastroenteritis Pneumonia Sepsis