Stools are an important part of assessing the health status of newborns. Whether the stools of newborns are normal or not is related to factors such as day age, feeding style, individual differences, etc., and needs to be analyzed specifically, e.g., the stools of babies within the age of 3 days can be dark green and be relieved about 2~4 times. Observation of stools, including the number of times per day and the character of stools, is an important element in assessing the state of the newborn’s digestive tract. In some diseases, such as necrotizing small bowel colitis of the newborn and infectious diarrheal disease, changes in the number and character of stools are seen. Within 3 days after birth, the newborn usually passes fetal stools, which are thicker in nature, black-green or dark green in color, usually without odor, and can be passed about 2 to 4 times a day, and can be converted to normal baby stools after 2 to 3 days of adequate breastfeeding. For babies who start to pass baby stools, if they are breastfed, the normal stools can be yellow or golden yellow uniform creamy stools, occasionally slightly dilute can be slightly greenish, not smelly, and can be relieved 2~4 times a day. Some babies may have more frequent stools, such as 5 to 6 times, but this is normal if the baby has no abnormal symptoms and has good weight gain. For formula-fed babies, the stools are drier and thicker and may be yellowish or grayish yellow in color, and may be relieved about 1 to 2 times a day. It is advisable to consult a specialist for a comprehensive assessment of whether the stools are normal or not.