Newborn baby stool oil and water separation refers to diarrhea, mostly seen in indigestion, lactose intolerance, autumn diarrhea and so on. 1. indigestion: a relatively common functional disease in newborns, mainly because of the imperfect development of the digestive function of newborns, the digestive ability is relatively weak, if not fed properly, it may lead to indigestion, causing diarrhea, abdominal distension, more milk petals in the stool and other symptoms. 2. Lactose intolerance: mainly caused by the lack of lactase enzyme that digests lactose, which often causes diarrhea, abdominal pain, bloating and other symptoms after a newborn eats dairy products, such as breast milk. 3. Autumn diarrhea: an intestinal disease mainly caused by rotavirus infection, which often causes frequent diarrhea and even nausea and vomiting. Newborn diarrhea can also be caused by other reasons, it is recommended to consult a doctor for timely diagnosis so that early treatment.