Infants with yellow, watery stools can be caused by intestinal infections, gastrointestinal cold and lactose intolerance. 1. Intestinal infections: If an infant has an intestinal infection, rotavirus infection is common, which can be manifested by yellow stools, watery stools, abdominal pain, nausea, vomiting and other symptoms. 2. Gastrointestinal cold: If the infant eats cold food, such as cold milk, and at the same time, the environment temperature is low, resulting in faster gastrointestinal peristalsis, there may be a yellow, watery stool, accompanied by abdominal pain, abdominal distension, increased bowel sounds and other manifestations. 3. Lactose intolerance: infants often lack the enzyme to digest lactose, resulting in drinking milk and other dairy products, the gastrointestinal tract is unable to break down lactose, which in turn appears to have yellow watery stools, accompanied by abdominal distension, gas and other symptoms. There may be other reasons why babies have yellow watery stools, so it is recommended that they go to the hospital in time for a complete examination to determine the cause of the problem, and then give targeted treatment under the guidance of the doctor.