Intussusception is the most common abdominal emergency situation in infants and small children. There has been great progress in diagnostic and therapeutic management of intussusception. Ultrasound (US) has been shown to be the first-choice imaging technique in diagnosing intussusception for reasons of high accuracy, simultaneous exclusion of differential diagnoses, and disclosure of additional pathologies. Controversial opinions exist worldwide concerning the nonoperative treatment of intussusception in infants and children. Pneumatic reduction under fluoroscopic guidance and hydrostatic reduction under US monitoring are the preferred techniques. The aim should be a success rate of at least 90% in idiopathic intussusception. This review summarizes different types of intussusception and outlines diagnostic aspects as well as several treatment concepts.