Breastfed infants who do not have bowel movements for four days may be caused by physiological factors or by pathological factors such as constipation. According to the cause of the disease, we can take general treatment, cecrops and other medication. 1. Physiological factors: breastfed babies, especially in two or three months, due to the small amount of food residue, can appear to save the belly, manifested as a decrease in the frequency of stool, but the baby is not accompanied by any other discomforts, the stool is also relatively thin and soft. At this time, the mother can help the baby massage abdomen, stimulate anal defecation, no other special treatment. 2. Constipation: Breastfed babies can also suffer from constipation, which manifests itself as a decrease in the frequency of defecation, four days without defecation, and at the same time, there can be farting odor, difficulty in defecation, abdominal distension, overflow of milk and so on. Parents can strengthen the abdominal massage, and follow the doctor’s instructions to soften the stool, and combined with probiotics (such as bacillus subtilis bacillus granules) to regulate the stomach and intestines. Breastfed babies do not have bowel movements for four days, there may be other reasons, it is recommended to exclude the physiological causes of active medical treatment to find the cause, under the guidance of the doctor’s scientific use of medication.