A 2.5-month- old male was admitted to the hospital for dehydration associated with persistent diarrhea. The patient had no history of fever, vomiting, or hematochezia. Attempts to breast-feed the patient early in life were unsuccessful secondary to diarrhea that began on day 4 of life. During the prior 2.5 months, the patient had been tried on multiple formulas including cow's milk-based, partial hydrolysate, and amino-acid formulas, with continued diarrhea. Past Medical History: The patient was a full-term infant with a birth weight of 3.6 kg. There were no complications reported with labor or delivery.
There was no history of medical problems. Family history was unremarkable. The patient was not taking any medications and had no recent illnesses or sick contacts. Physical Examination: The patient was in the 10th percentile for weight and length. He was in no acute distress. The mucous…
