Which of the following clinical manifestations is commonly seen in pyloric stenosis?

A. Abdominal distention is not a primary feature of pyloric stenosis. Instead, vomiting and dehydration are more commonly observed. B. Diarrhea is not a typical symptom of pyloric stenosis, as the condition primarily causes vomiting rather than changes in stool consistency. C. Constipation is not a major feature of pyloric stenosis; the child may experience other gastrointestinal symptoms like vomiting and poor feeding. D. Projectile vomiting after feeding is the hallmark symptom of pyloric stenosis. This vomiting typically occurs within 30 minutes of feeding and may become forceful as the condition progresses.