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A 19-month-old boy with a medical history of 1 febrile seizure presented to the emergency department (ED) with 2 days of vomiting and 1 day of diarrhea. He was accompanied by his non–English-speaking mother, who reported several episodes of nonbloody, nonbilious emesis and dark brown, watery stools. The patient had decreased intake of solid foods, but he had been breastfeeding well. Because of his diarrhea, the patient’s mother was unsure how many voids he had had in the past day. He had not had fevers. The family history was significant for the patient’s father recently being diagnosed with hepatitis C. The patient’s mother brought him into the ED because of his symptoms and concern that he looked “yellow.” In the ED, the patient was afebrile with normal vital signs for his age (including heart rate of 146 beats per minute), and he was “well appearing and active” with moist mucous membranes and a …