The anatomical structure and physiological functions of all parts of the gastrointestinal tract in children are described. Particular attention is paid to motor skills, its regulation and disorders. Etiology, pathogenesis, clinical presentation, diagnosis and treatment of diseases and congenital malformations causing gastrointestinal obstruction are highlighted. For pediatric surgeons, pediatricians, radiation diagnostics doctors, general surgeons, graduate students, residents, medical students.