A 9-month old girl with Trisomy 21 presents with acute non bilious emesis, worsening over 5 days. She has a history of intermittent vomiting and poor weight gain since birth, diagnosed and treated as gastro-esophageal reflux disease. Exam shows a deyhdrated, but non-toxic baby weighing 5.4 kg (15th percentile). Her abdomen is soft and non-tender. Laboratory tests show a severe hypokalemic hypochloremic metabolic alkalosis and hemoconcentration. A films is shown below. How would you proceed with this patient?
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