Milk flap stools are associated with indigestion, lactose intolerance and acute gastroenteritis. 1. Indigestion: Some children may have milky stools due to indigestion when they consume too much breast milk or milk powder when their digestive system is not yet mature. 2. Lactose intolerance: Lactose intolerance is caused by a deficiency in the enzyme lactase, which is responsible for digesting lactose, and the patient is usually unable to fully digest the lactose in dairy products. Therefore, when lactose intolerant children consume dairy products, they often have milky stools, which are easily accompanied by bloating, nausea and vomiting, and other discomforts. 3. Acute gastroenteritis: Acute gastroenteritis is associated with pathogenic microbial infections, improper diet, etc., but also due to disease-induced gastrointestinal dysfunction and the phenomenon of milky stools. Some patients with acute gastroenteritis may also experience abdominal pain, nausea and vomiting, loss of appetite and other symptoms. Parents are advised to take their children with milky stools to the doctor for examination and treatment after clarifying the cause of the illness, and not to use medication indiscriminately.