Symptoms usually begin between 3-6 weeks of age, rarely after 12 weeks
Vomiting, immediately postprandial, nonbilious, often projectile, but desires to feed ("hungry vomiter")
Palpable mass in in RUQ to epigastric region after vomiting, occasionally may see reverse peristaltic fluid wave across abdomen
If untreated, will see signs of dehydration, weight loss, lethargy, shock
Pyloric stenosis
Emergent
Gastric volvulus
Necrotizing Enterocolitis
Duodenal atresia
Volvulus
Achalasia
Testicular torsion