4-month-old babies do not poop may be physiological reasons, intestinal flora disorders, intestinal obstruction and other reasons, you can take probiotics or nasogastric tube decompression, surgical treatment and other ways of treatment. 1. Physiological reasons: 4-month-old babies due to the recent poor appetite, resulting in reduced breast milk intake or due to the baby’s digestion and absorption ability to enhance the intestinal fecal debris is too small, resulting in several days of non-pooping situation, it is recommended that breastfeeding mothers eat a light diet, and parents should often give the baby to do some abdominal massage, which will help the baby’s intestines and stomach to digest. 2. intestinal flora disorders: 4 months baby intestinal flora disorders can lead to poor digestion and absorption, baby constipation caused by several days without poop, you can follow the doctor’s advice to the baby supplement probiotics (such as bacillus subtilis bacillus granules) to help the baby defecation. 3. Intestinal obstruction: 4 months baby long time not poop should be alert to the occurrence of intestinal obstruction, intestinal obstruction leads to intestinal opacity, feces can not be discharged, should be timely fasting, at the same time, the nasogastric tube decompression, the failure to improve the symptoms of the person to require surgical treatment. 4 months the baby does not poop should go to the hospital in time to improve the examination, clear cause to give targeted treatment.