The nurse is caring for a 5-week-old infant who has been experiencing projectile vomiting after feedings. What additional symptom should the nurse anticipate?

Choice A rationale While it’s possible for an infant with projectile vomiting to have stool containing mucus and blood, this is not typically associated with the condition that most commonly causes projectile vomiting in infants, which is pyloric stenosis. Choice B rationale An olive-sized mass in the epigastric region is a classic symptom of pyloric stenosis. This condition occurs when the muscle between the stomach and the small intestine (the pylorus) thickens, preventing food from moving from the stomach to the intestine. Choice C rationale Frequent burping and poor feeding can be symptoms of many different conditions in infants, but they are not typically associated with pyloric stenosis. Choice D rationale Rebound tenderness in the left lower abdominal quadrant is a symptom of conditions like appendicitis, but it is not typically associated with pyloric stenosis.