A 10-day-old infant born to a diabetic mother presents with persistent vomiting and dehydration. She is found to have pyloric stenosis and undergoes pyloromyotomy. Postoperatively, she continues to have vomiting. Upper gastrointestinal series demonstrates an antral web. What is the next step in management?
a) Observe
b) Repeat pyloromyotomy
c) Gastrojejunostomy
d) Metoclopramide