<prompt> A neonate presents with bilious vomiting. What is the first investigation ___Abdomen X-rayBaby gramCTUSG  <response>: In contrast, intestinal malrotation, a congenital anomaly in rotation of the midgut as it forms, presents as intermittent bilious vomiting, usually with significant abdominal distension. Bilious or bile-stained vomiting should be treated as a potential surgical emergency. Reference: GHAI Essential pediatrics, 8th edition Nutrition Chapter 