The shape of infant’s stool will change with the age of the month. From 1 to 12 months old, the shape of infant’s stool will gradually develop from a soft texture at the beginning to a banana shape at the end. 1. Newborn to 1 month: The color of the stool at this time is dark green or black, usually thick and not yet formed. 2.1~2 months: During this period, the infant’s digestive system begins to develop and absorption is poor. The stools are still soft and watery, but they do not have a distinctive flavor. 3.3~5 months: At this time, the baby’s stools begin to form gradually, the color is golden, and the frequency of stools will gradually decrease compared with the previous period. 4.6~12 months: At this stage, some infants may add complementary foods, so the shape of the stools may vary according to the complementary foods, but they are basically formed, mostly banana-shaped, and have a foul odor. The feces of infants from 1 to 12 months of age may vary according to the different diets and the increase in the age of the month. Normally, more attention should be paid to the dietary ratios of the infants, and medical attention should be sought in time if there are any problems.