Four and a half year old children always do not poop may be drinking less water, sweating or functional constipation and other diseases, four and a half year old children always do not poop may be too little food, constipation, intussusception and other diseases caused by different causes, different treatment methods. 1. Drink less water, sweat more: four and a half year old children always do not pull the urine may be less water, sweat more caused by the normal physiological phenomenon, you can feed the child more water to ease. 2. Eating too little: four and a half year old children if eating too little can appear always not poop symptoms, this is a normal phenomenon, need to increase the amount of food for children, increase the intake of dietary fiber to promote the formation of stools. 3. Functional constipation: four and a half year old children if constipation occurs, can also appear to always not poop symptoms, treatment can be used for treatment, but avoid long-term use. Probiotics (bacillus subtilis bacillus granules) can be used as prescribed by the doctor. 4. Intussusception: Intussusception is a kind of disease in which part of the intestinal tube and its mesentery is set into the intestinal lumen connected with it and causes obstruction to the passage of intestinal contents, which is most common in children, and children with this disease may also have the symptom of not having bowel movements all the time. After excluding physiological factors, if a four and a half year old child always does not poop or the symptoms of bowel movements continue to be unrelieved, he or she should consult a doctor in time to avoid delaying the condition.