A 2-year-old child who does not poop for a few days may be constipated due to diet, irritable bowel syndrome, congenital hypothyroidism, etc., and can be treated with dietary adjustments and medications according to the situation. 1. Diet: If a 2-year-old child eats a small amount of food, food lacks fiber or insufficient water, the stimulation of colonic motility is reduced may cause constipation. You can increase the amount of cereals and grains containing dietary fiber in your daily diet, and reduce the intake of foods high in oil and salt, and high in sugar. 2. Irritable bowel syndrome: by the colon and sigmoid colon spasm and other causes of irritable bowel syndrome, may also lead to constipation in 2-year-olds, you can take laxatives such as lactulose for treatment. At the same time also need to pay attention to diet, avoid excessive fat and stimulating food, can eat more high fiber food (such as celery) can stimulate the colon movement, to improve constipation has obvious effect. 3. congenital hypothyroidism: 2-year-old children may also be due to thyroid deficiency or ectopic, gene mutation and other causes of congenital hypothyroidism, can take levothyroxine sodium tablets and other thyroid hormone for treatment. Constipation is also caused by intestinal obstruction and other reasons, so 2-year-old children if constipation is serious, it is recommended to go to the regular hospital in time to find out the cause of the disease, so as not to cause adverse consequences. The above drugs should be used in accordance with medical advice.