Baby boy Smith weighs 6 pounds, 4 ounces at his one month ch…

Baby boy Smith weighs 6 pounds, 4 ounces at his one month check up.  His birth weight was 7 pounds 8 ounces.  Mom reports that baby takes only 2 ounces of milk per feeding and always vomits afterwards.  View the attached image.  The sonographic finding is suggestive of which of the following? appendicitis, intussusception, pyloric stenosis, bowel obstruction 1. Chose only one as your correct diagnosis 2. Tell me WHY the other three choices are not correct