The baby’s stool volume may be normal physiological phenomenon, may also be caused by gastrointestinal diseases. 1. Normal physiological phenomenon: (1) eating less: generally speaking, the baby’s stool volume and the amount of food is positively correlated, if the baby’s stool less, may be due to eating less caused by breastfeeding babies, can be used to suck the breast milk out of the breast pump, roughly determine the baby’s food and whether there is a breastmilk can not meet the baby’s needs. If the amount of breast milk is too small, the baby may also be accompanied by frequent crying, a single breastfeeding time is long and other phenomena, you need to consult a doctor to add milk powder to the baby as appropriate. (2) save belly: the baby before and after the full moon to two months of time, digestive function to enhance the absorption function to improve, can be fully digested and absorbed breast milk, resulting in a reduction of food residue, not enough to stimulate the rectum to produce defecation reflexes, the phenomenon of saving belly. At this time, generally not accompanied by abdominal distension, crying and other symptoms, can be appropriate to increase the amount of food, do not need to do special medical treatment. 2. Gastrointestinal diseases: if the baby has intestinal obstruction, indigestion and other symptoms can also lead to a decrease in the amount of defecation. The baby may also be accompanied by abdominal distension, vomiting and other symptoms, need to go to the hospital to complete the relevant examination for targeted treatment.