Vomiting on the first day of baby's life may be caused by all of the following except –

A large number of normal babies vomit on first day due to irritation of stomach by swallowed amniotic fluid The regurgitation / vomiting in a neonate is due to -> faulty feeding techniques or, aerophagy Eosophageal atresia may present with vomiting on the first day. In hypertrophic pyloric stenosis vomiting characteristically occurs after 2 weeks of age. (2-3 weeks).