In which condition would you expect to see non-bilious vomiting in infants?

Non-bilious vomiting in infants is most commonly associated with pyloric stenosis. This condition occurs when the pylorus, the passage from the stomach to the small intestine, becomes hypertrophied and obstructs the outflow of stomach contents. As a result, infants experience projectile vomiting that does not contain bile, since the obstruction prevents bile from reaching the stomach.

In the context of pyloric stenosis, the characteristic non-bilious vomiting is due to the fact that the blockage is proximal to the point where bile enters the intestinal tract. Therefore, the vomit is usually described as "projectile" and can be quite forceful, leading to dehydration and electrolyte imbalances in affected infants.

Other conditions, such as intestinal malrotation, Meckel's diverticulum, and Hirschsprung's disease typically do not present with non-bilious vomiting as their primary symptom. In malrotation, for instance, bilious vomiting can occur if there is an obstruction due to volvulus. Meckel's diverticulum may lead to complications like obstruction but also can produce symptoms a bit later than pyloric stenosis; Hirschsprung's disease usually presents with constipation and abdominal distension rather than immediate vomiting.

Recognizing the distinction between