One year old babies can be caused by physiological factors such as drinking less water, diet imbalance, etc., may also be caused by pathological reasons such as constipation, congenital megacolon, etc., should be from the regulation of diet, medication, surgical treatment, etc. to improve. 1. Physiological factors: one year old baby dry stool pull out with intestinal water, so you should drink more water every day, you can also drink the appropriate juice, vegetable juice, etc., diet to light, try not to eat fried food and sweets, eat more fresh fruits and vegetables and other foods containing crude fiber. 2. Constipation: long-term constipation can lead to anal fissure, which can lead to unsmooth discharge of stool, if the stool really can not be discharged smoothly, you can temporarily deal with the Kespelia, repeated bowel dryness can be given probiotics (such as Bacillus subtilis bacillus granules) to regulate intestinal flora. 3. Congenital megacolon: manifested as abdominal distension, persistent constipation, the treatment is mainly based on surgical treatment. In addition to the above relief methods, you should develop the habit of defecating on time every day, exercise more, and eat a diversified diet, etc. If the dryness of the stool cannot be relieved, it is recommended to go to the hospital in time for consultation and treatment, and the above medications need to be taken under the guidance of a doctor.