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QUESTION: A mother brings her full-term 3-day-old male newborn to the ED after she noticed an episode of dark tarry stool at home. Mom delivered the newborn vaginally without any complications. Mom is a vegetarian and is breastfeeding. On exam, the patient is afebrile. His abdomen is soft with no palpable masses. Rectal exam reveals dark tarry stool that is guaiac positive. Which of the following is the most likely cause of this patient’s presentation?

A. Meckel’s diverticulum
B. Milk protein allergy
C. Necrotizing enterocolitis
D. Swallowed maternal blood

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