A 1-month-old baby presents with projectile, non-bilious vomiting after feeding. On examination, there is a palpable 'olive-like' mass in the epigastrium. Which is the most likely diagnosis?AGastro-oesophageal refluxBCongenital megacolonCPyloric stenosisDDuodenal atresiaEMalrotation with volvulusCheck my answer