What to Do When a Four-Month-Old Baby Experiences Green Stools After Drinking Formula Milk?

A four-month-old baby has been experiencing dark green stools since starting formula milk over a month ago. Although the baby has seen a doctor and been prescribed medication, the issue persists, and a timely stool test was not possible due to time constraints. The baby is otherwise normal with no other symptoms and is in good spirits. How should this situation be handled?
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