It is a common occurrence for pregnant women to pass green poop and there are a variety of reasons for this, including intestinal ailments like IBS or IBD, prenatal vitamins, certain medications like antibiotics, diet changes as pregnant women are advised to consume meals high in vitamins and minerals, and, lastly, decreased colon transit time.
Any of these factors can result in a green stool color, but if you haven’t been taking vitamins or added extra greens to your diet, you may want to speak to your doctor about other conditions that may contribute to green poop.