Watery poop in newborns can be caused by cold, indigestion, intestinal infections, lactose intolerance and so on. 1. Cold: it may be due to the newborn’s abdomen is cold, resulting in intestinal peristalsis accelerated, it will lead to watery stools. 2. Indigestion: Most of the breastfed babies are caused by their mothers eating spicy and stimulating or greasy food, while formula-fed babies may suffer from indigestion due to overfeeding, and breastmilk or milk powder can not be fully digested and absorbed. 3. Intestinal infections: may be caused by viral or bacterial infections, the more common is rotavirus infection or Escherichia coli infection, easy to cause watery stools. 4. Lactose intolerance: It is mainly caused by the lack of lactase enzyme in newborns. Eating dairy products, such as breastmilk or milk powder, will lead to watery poop. Newborns poop with water, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.