A 30 dаy оld, fоrmer 29 5/7 week, infаnt is tоlerаting enteral feeds at 150 mL/kg/day of 24 calorie breast milk and demonstrating good weight gain. The baby is beginning to work on oral feedings. He continues to have emesis which appears to be unrelated to the timing of feedings. The infant is having bradycardia and desaturations at least 5 times per day, and nearly all of the episodes are self-resolved. Which of the following is the most appropriate intervention for reflux in this infant?