A 26-year-old third gravida mother delivered a male baby weighing 4.2 kg at 37 weeks of gestation through an emergency caesarean section, for obstructed labour. The child developed respiratory distress one hour after birth. He was kept nil per orally (NPO) and given intravenous fluids. He maintained oxygen saturation on room air. No antibiotics were given. Chest radiograph revealed fluid in interlobar fissure. Respiratory distress settled by 24 hours of life. What is the most likely diagnosis?

## **Core Concept**
The question revolves around a newborn presenting with respiratory distress shortly after birth, with specific details pointing towards a condition related to the presence of fluid in the lungs, as indicated by the chest radiograph. The clinical scenario suggests a condition known as **transient tachypnea of the newborn (TTN)**, which is a self-limiting condition.

## **Why the Correct Answer is Right**
The correct answer, **Transient Tachypnea of the Newborn (TTN)**, is likely because the baby presented with respiratory distress that resolved within 24 hours, maintained oxygen saturation on room air, and had a chest radiograph showing fluid in the interlobar fissure. TTN occurs due to delayed clearance of fetal lung fluid after birth, a condition more common in babies delivered by cesarean section without labor, especially if performed before the onset of labor. The presence of fluid in the interlobar fissures on the chest X-ray is a classic finding.

## **Why Each Wrong Option is Incorrect**
- **Option A (Neonatal Pneumonia):** This is unlikely because the baby's respiratory distress resolved within 24 hours without the use of antibiotics, and there's no mention of specific findings suggestive of infection.
- **Option B (Meconium Aspiration Syndrome):** This condition typically presents with a history of fetal distress, post-term delivery, and characteristic radiographic findings of overinflation and coarse infiltrates, not mentioned here.
- **Option D (Respiratory Distress Syndrome (RDS) or Hyaline Membrane Disease):** This condition usually occurs in preterm infants due to surfactant deficiency, leading to more severe and prolonged respiratory distress than described.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **Transient Tachypnea of the Newborn (TTN)** is a diagnosis of exclusion and is more common in term infants born by cesarean section without labor. The condition typically resolves within 24-48 hours, and management is supportive, including maintaining adequate oxygenation and often not requiring more than room air.

## **Correct Answer:** . **Transient Tachypnea of the Newborn (TTN)**

✓ Correct Answer: A. Transient tachypnea of the newborn