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Baby, A preterm female infant, was born to a primi mother at 33 weeks of gestation with a birth weight of 1.5 kg. Tracheo-esophageal fistula was diagnosed on antenatal scan and was confirmed after birth. The infant underwent primary end-to-end anastomosis on day 2 of life and was sustained by mechanical ventilation postoperatively. On day 5 of life, when the baby was on setting of peak inspiratory pressure of 15 mm Hg/peak, end-expiratory pressure of 4 mm Hg, and FiO 2 of 30%, there was a progressive increase in pressure and oxygen requirement. Suspecting air leak transillumination test was executed with a new LED device (Vein Finder @MIHIR NICS, Hyderabad, India). Transillumination tests confirmed the pneumothorax. Chest tube was inserted and baby improved dramatically.