paeds1143
A term infant delivered via C-section develops tachypnoea, grunting, flaring, and intercostal retractions 10 minutes after birth. A chest radiograph reveals well-aerated lungs with fluid in the fissure on the right, prominent pulmonary vascular markings, and flattening of the diaphragm. His oxygen saturation is 90%. He improves within a few hours and requires no oxygen. What condition is this infant most likely suffering from?