Green
Many babies occasionally have green poop. Possible causes include:
slow digestion, usually because the baby has eaten more than usual
green foods in the diet of the person producing breast milk
a cold or stomach bug
a food allergy or intolerance
antibiotics, either in the baby or in the person producing breast milk
treatment for jaundice
Some infants’ poop is naturally slightly green. If the baby is putting on weight and seems content, green poop is not necessarily a cause for concern.