It is not normal for newborns to have yellowish watery stools when they are breastfed, which can be caused by indigestion, intestinal infections, lactose intolerance, and so on. 1. indigestion: newborn gastrointestinal tract development is not perfect, feeding too much, breast milk fat content is high, will lead to indigestion, yellow watery stool. 2. Intestinal infections: Mother’s nipples are not clean, bacteria or viruses enter the gastrointestinal tract of newborns with breast milk, resulting in intestinal infections and the appearance of yellow watery stools. 3. Lactose intolerance: due to the lack of lactase enzyme in the body, resulting in diarrhea and other symptoms after eating dairy products, which can be yellow watery stools, egg-shaped stools and so on. Newborns eating breast milk yellow watery stools may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.