What is a clinical manifestation of pyloric stenosis?

Non-bilious vomiting is a key clinical manifestation of pyloric stenosis. This condition occurs when the pylorus, which is the opening from the stomach to the duodenum, becomes narrowed, obstructing the passage of food. As a result, babies with pyloric stenosis typically vomit forcefully shortly after eating, and the vomit does not contain bile, hence it is referred to as non-bilious.

This symptom usually develops after an infant begins to feed more regularly and is often described as projectile vomiting. Parents may notice that the infant appears hungry after vomiting, which indicates that the obstruction is making it difficult for the child to retain food.

Understanding this clinical manifestation is crucial for identifying pyloric stenosis early, so timely intervention can occur, as untreated pyloric stenosis might lead to dehydration and electrolyte imbalances due to repeated vomiting. The other options listed do not represent the primary symptoms associated with this condition, further emphasizing non-bilious vomiting as a classic sign.