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What is Transient tachypnea of new born (TTN) is commonly seen in which of the following situations – and explain in detail?
In text books, both elective caesarian section and normal preterm or term vaginal delivery have been mentioned as risk factors for transient tachypnea of newborn.
But the best answer is caesarian section -

"Delivery by caesarian section and gestational age are the risk factors for TTN". —Articles Obs & Gynae Transient tachvpnea of Newborn (TTN) 

Transient tachypnea of the newborn is a benign self-limiting disease occuring usually in term neonates and is due to delayed clearance of lung fluid.
It is also called respiratory distress syndrome type H
TTN follows -


Uneventful normal preterm or term vaginal delivery
Cesarean delivery


TTN is believed to be secondary to slow absorption of fetal lung fluid resulting in decreased pulmonary compliance and tidal volume and increased dead space therefore also known as wet lung.
Clinical manifestations


Early onset of tachypnea

El Sometimes refraction or expiratory grunting
u Occasionally cyanosis

Patients usually recover rapidly within 3 days.

Hypoxemia, hypercapnia and acidosis are uncommon.