A 6-week-old infant born in Delhi presents with intermittent bilious vomiting and failure to thrive. Abdominal examination reveals visible peristaltic waves from left to right. Ultrasound shows the superior mesenteric artery (SMA) positioned to the left of the superior mesenteric vein (SMV). The child is afebrile and haemodynamically stable. What is the most appropriate next step in management?

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