Yes, pooping green occasionally is normal. In fact, green is in thenormal range of infants’ stool[/en/baby-poop-whats-normal-whats-not] colors, and so are the yellow,the seedy mustard and the brown. The following are many of the causes associated with green stools:- Unsuccessful breastfeeding- Excess of milk- Stomach bug- Sensitivity/ allergy to a food or medication (whether consumeddirectly or through the mother’s diet).That said, a green poop is nothing to be worried about as long as yourlittle one is fine and gaining weight. Yet the variations of red,white and black are the ones you shouldn’t ignore, as they canindicate an illness or an infection that needs to be treatedstraightaway.