<prompt> What is the most characteristic of congenital hypertrophic pyloric stenosis?Affects the first born female childThe pyloric tumor is best felt during feedingThe patient is commonly marasmicLoss of appetite occurs early  <response>: Ans. b The pyloric tumour is best felt during feedingRef: Sabiston 20th Edition, Page 1869 Baby is not marasmic. It feeds vigorously in between the episodes of vomiting 