The causes of watery stools in newborns for ten days include lactose intolerance, milk allergy and infections. 1. Lactose intolerance: the manifestation of milk into the milk immediately after the bowel movement, stools with water, foamy. A positive test for reducing sugar and a low pH value can confirm the diagnosis, which needs to be treated with lactase and lactose-free milk powder when taking milk. 2. Milk allergy: breastfeeding children, mothers do not eat shrimp and crab, eggs, milk, peanuts and other easily allergic foods, general taboos, stools will improve. If milk feeding to eat amino acid milk powder to get better. 3. Infectious enteritis: viral and bacterial infections will also have watery stools, check the stool routine with white blood cells is a bacterial infection, bacterial infections need to be treated with cephalosporin antibiotics; there are no white blood cells, the rotavirus antigen is positive rotavirus infection, or other viral infections, which requires rehydration, electrolyte replacement therapy. Newborns with water in the stool should go to the hospital pediatrics to find the cause, and then targeted treatment, do not buy medicine without authorization, to prevent adverse consequences.