An ex-full term six-week old male presented to the pediatric emergency department with three weeks of forceful, non-bloody, non-bilious emesis. He was having two to four episodes of vomiting that occurred after feeding. Three weeks prior, the patient had been transitioned from breast milk to formula, and attempts to thicken the formula by adding rice had not improved his vomiting. More recently, he had poor PO intake and his parents were concerned about his weight. He had no fevers, no change in number of wet diapers or stooling, and no other acute complaints…

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