What is the reason for the baby having diarrhea after eating yeast powder and then having black stools?

Patient's question:

Basic Information: Male, 2 months
Disease/Symptoms: Baby has diarrhea, after taking Yeast Powder and Du La Bao, the baby has black stools.
Symptom Description: A 52-day-old baby has diarrhea. After taking Yeast Powder and Du La Bao, the baby developed black stools. What could be the reason?

Doctor's answer:

The symptoms of the baby should be considered as indigestion, which may be caused by a cold. Avoid eating yeast for the time being. It is recommended that you give the baby anti-diarrheal medication, pay attention to observing various aspects of the infant, keep the baby hydrated, and ensure warmth while avoiding exposure to cold. If the child's condition is severe, it is best to take them to the hospital for examination. Pay attention to keeping the baby warm and massage the abdomen frequently.