Congenital diaphragmatic hernia (CDH) is a severe congenital malformation that occurs as a result of delayed closure of the pleuroperitoneal canal or the diaphragm failure, which leads to the displacement of abdominal organs into the thoracic cavity. Timely diagnosis of recurrent diaphragmatic hernia in the long-term period causes great difficulties. The article presents a clinical observation of a 1-year-and-8-months old female patient operated on for false congenital diaphragmatic hernia and congenital heart defect during the newborn period. Chest X-ray at the outpatient stage allowed diagnosing a relapse of CDH and determining the urgency of hospitalization. In the hospital, the diagnosis was confirmed by computed tomography, surgical treatment was performed.