The two-month-old baby did not poop for four days, may be caused by physiological factors, but also may be constipation and other pathological factors, you can take the general treatment, medication and so on. 1. physiological factors: breastfeeding children in two months or so easy to change the regularity of stools, usually not accompanied by defecation effort, dry stools, loss of appetite and any other discomfort. At this time there is no need for special treatment, you can give the baby to do exhaust exercises, abdominal massage, etc., to help defecation. 2. Constipation: In addition to the decline in stool frequency, usually accompanied by dry stools, abdominal distension, increased exhaust, fart odor and other symptoms. You can take abdominal massage, perianal stimulation to guide defecation; if the effect is not good, you can apply probiotics (such as bacillus subtilis dictyostelium granules) under the guidance of a doctor to regulate intestinal flora. The two-month-old baby did not poop for four days, there may be other factors such as indigestion, it is recommended to exclude physiological factors and then actively seek medical attention to find the cause of the above medication need to comply with the doctor’s instructions.