Three-year-old children five or six days without stool is not normal phenomenon, mostly considered for constipation, may be due to dietary structure is not reasonable, irritable bowel syndrome or intestinal diseases and other reasons. 1. Dietary structure is unreasonable: three-year-old children if the dietary structure is unreasonable, such as lack of dietary fiber intake, often eat a lot of too greasy food, etc., may lead to constipation and cause five or six days without stool. 2. Irritable Bowel Syndrome: When a three-year-old child develops Irritable Bowel Syndrome, it can lead to the slowing down of the transmission of the colon, which may cause constipation, thus manifesting the phenomenon of not having bowel movements for five or six days. 3. Intestinal diseases: If a three-year-old child has problems such as narrowing or obstruction of the intestinal lumen, megacolon, etc., it may cause constipation, which may lead to the phenomenon of not having bowel movement for five or six days. Three-year-old children five or six days without stool may also be related to other causes, should be timely medical care, a clear diagnosis of the cause of the disease, to give targeted treatment and conditioning.