A newborn infant is delivered at 30 weeks since the last menstrual period. At birth, the infant weighs 1500 gm but otherwise appears normal. Soon after birth, the infant becomes cyanotic and breathes with a grunting noise. Chest X-rays reveal dense lungs with significant atelectasis but no cardiovascular abnormalities.
Question
What is the most likely diagnosis?
1 Congenital diaphragmatic hernia
2 Coarctation of the aorta
3 Tetralogy of Fallot
4 Bilateral renal agenesis
5 Respiratory distress syndrome