Normal feces for the first three days of life are thick, olive-green, and odorless, after which they change according to the feeding regimen. At birth, newborns’ feces consist mainly of shed intestinal epithelial cells, digestive juices, and amniotic fluid. The shape and color of the newborn’s feces vary with the feeding method. When human milk is fed, the newborn’s feces is uniformly creamy or with a few yellow fecal pellets, or it is thin, green, and does not smell bad. When artificially fed, because cow’s milk or formula is high in casein, there is a distinct odor of protein breakdown, and sometimes the stool is mixed with white protein clots. It is pale yellow or grayish yellow in color and is relatively dry and thick.