This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': "Vomiting on the first day of baby's life may be caused by all of the following except - \nSelect and explain. \nA. Pyloric stenosis, B. Oesophageal atersia, C. Aerophagy, D. Amniotic gastritis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans is 'a' i.e., Pyloric stenosis o A large number of normal babies vomit on first day due to irritation of stomach by swallowed amniotic fluid o The regurgitation / vomiting in a neonate is due to --> faulty feeding techniques or, aerophagy o Eosophageal atresia may present with vomiting on the first day. o In hyperophic pyloric stenosis vomiting characteristically occurs after 2 weeks of age. (2-3 weeks).", 'role': 'assistant'}]