A breastfeeding 22-day-old infant was suddenly unable to hold down any milk after 3 weeks of normal feeding. In the pediatrician's office, the baby is obviously famished, presents with abdominal pain, appears slightly dehydrated, and has loose, watery stools. His mother nurses him in the office, and approximately 20 minutes later, the infant projectile vomits. The doctor notes the nonbilious and non- bloody vomitus. What is the most likely diagnosis for this infant?
(A) Esophageal atresia
(B) Pyloric stenosis
(C) Upper gastrointestinal (GI) bleed
(D) Lower GI bleed
(E) Intestinal obstruction
Ans: (B) Pyloric stenosis
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