According to researches, congenital diaphragmatic hernias in children amount to 1:2500 and are most often on the left side. Children do not improve despite intubation and ventilation. The prognosis depends on the degree of pulmonary hypoplasia and is bad if, despite adequate ventilation, C02 values fail to decrease. High pulmonary arterial pressure and hypoxemia favor the reopening of the Ductus Botalli leading to a right-to-left shunt with catastrophic consequences. Factors that could improve the situation include: less aggressive ventilation, NO and choosing the optimal time for operative work. The operation is performed with lung stabilization, FiO2 < 40%, lower dose or without vasoactive drugs. Occasionally, diaphragmatic hernias become apparent only after several weeks or months as an incidental finding. Today's trend includes thoracoscopic surgery and intrauterine tracheal occlusion with peripartum removal and intubation. Surgical treatment will not bring immediate improvement, but continued intensive treatment and adequate ventilation gives good results. Our patient was eleven months old child (SE). On 19 September 2017 the child underwent VSD surgery and following the lungs X-ray check-up, a random finding confirmed the existence of a congenital diaphragmatic hernia on the left. The child was scheduled for surgery sixty days after the heart surgery. Preoperative preparations were made in terms of a complete blood count, mineralogram, ABS, heart ultrasound. Cardiological antibiotic therapy was initiated along with the continued initial therapy (Lasix, Aldactone). The laparoscopic approach was performed on 2 November 2017. After intubation, press mode ventilation was applied. The operation lasted 45 minutes. The child was intubated and moved to the Intensive Care Unit, accompanied by an anesthesiologist. He stayed in intensive care for two days, and in good general condition was transferred to the Children's Surgery Clinic. On the sixth day of hospitalization, he was discharged home in a good general condition with a recommendation to continue therapy and regular monitoring. [ABSTRACT FROM AUTHOR]