One and a half years old dry stool may be physiological reasons, can drink more water, massage the abdomen; may also be pathological reasons, such as congenital megacolon, can be surgical treatment; and anal fissure, can be coated with erythromycin ointment and so on. 1. Physiological reasons: one and a half year old children if you drink less water, eat less vegetables, no good defecation habits, there may be dry stools, you should adjust the dietary structure, drink more water in moderation, increase the intake of dietary fiber-rich vegetables and fruits, but also clockwise massage of the child’s abdomen to promote gastrointestinal motility, promote the discharge of stools. 2. Congenital megacolon: congenital megacolon is a disease caused by intestinal ganglion defects, which can be manifested in the form of low intestinal obstruction, persistent constipation, abdominal distension, dry stools and other symptoms, and can be selected for surgical treatment. 3. anal fissure:If the child has anal fissure, pain during defecation, have painful memories, the child will reject the bowel movement, which leads to dry stools, can be coated with hemorrhoidal ointment, erythromycin ointment, etc., usually pay attention to anal hygiene. One and a half year old children with dry stools should be timely to the hospital, under the guidance of the doctor to identify the causes and treatment.