Three-year-old children four days without stool is mostly related to constipation caused by too little water intake, improper diet, etc.; it may also be related to intestinal obstruction. 1. Constipation. When a person’s recent water intake is too small, or intake of coarse food is too small, it can lead to dry stools, slow intestinal peristalsis, resulting in four days without bowel movement and a tendency to constipation. 2. Intestinal obstruction. When intestinal intussusception, intestinal hernia, fecal impaction may cause intestinal obstruction, resulting in rectal contents in the intestinal tract through the obstruction, can not be normal defecation, resulting in four days without bowel movement, may also be accompanied by abdominal pain, vomiting and other symptoms. When a three-year-old child does not have a bowel movement for four days, the cause can be clarified under the guidance of a doctor, and active treatment, daily life should maintain a light diet and avoid spicy food.