Question

My baby has been passing dark green stools since the second month, and this continues even now at four and a half months old. The baby has a bowel movement once a day, and is fed formula milk. Why does the baby’s stool always remain dark green?

Answer

A baby’s green stools may be due to rapid intestinal peristalsis, which causes bile not to be fully digested and thus to be excreted. Another possibility is that the baby’s excessive stomach acid production, possibly due to an unsuitable formula, can affect stool color. It is recommended to try changing the brand of formula to see if there is any improvement.