A 5-day-old infant presented with shortness of breath, grunting, and poor feeding. Examination revealed reduced chest movements and diminished breath sounds on the left side. Chest X-ray showed pneumothorax. Pneumothorax is the presence of air in the pleural space, causing partial or complete lung collapse. It can be open, closed, or valvular. Causes include spontaneous (primary or secondary to lung disease) or traumatic (iatrogenic or non-iatrogenic) origins. Treatment options range from observation of small pneumothoraces to chest tube insertion or pleurodesis surgery for larger or recurrent cases.