Newborns with watery stools can be caused by intestinal infections, lactose intolerance and other factors. 1. Intestinal infections: common rotavirus infection and Escherichia coli infection and other intestinal infections, can appear egg yolk-like dilute watery stools, easy to lead to dehydration in newborns, can appear with watery stools. 2. Lactose intolerance: newborns lacking lactase or lactase insufficiency are prone to lactose intolerance when eating breast milk, and are prone to watery stools. Newborns with water in the stool, there may also be other reasons, such as protein allergies, etc., it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.