Milk vomiting or regurgitation in the first 3 months of life: Something old–something new

This article proposes a shared etiology between infantile reflux and mild pyloric stenosis, suggesting that acid-provoked pyloric sphincter hypertrophy causes temporary gastric outlet obstruction in both conditions. Drawing on historical clinical observations from 1921 and 1958, the authors recommend routine ultrasound measurement of pyloric sphincter thickness when evaluating reflux in infants under 3 months.