Whether or not the baby has diarrhea during breastfeeding depends on the cause of the mother’s diarrhea, which is often caused by improper diet, gastrointestinal inflammation or viral infections, etc., of which improper diet does not usually affect the baby. However, gastrointestinal inflammation and viral infections may cause diarrhea in babies. 1. Improper diet: including eating too much, eating indigestible food, or eating cold, greasy food and cause diarrhea. This condition usually does not affect breast milk, so it will not cause diarrhea in babies. 2. Gastrointestinal inflammation: If the mother has diarrhea due to gastrointestinal inflammation, it is often accompanied by fever, which can easily affect the baby during breastfeeding, and if the inflammation is more serious, it may lead to the baby’s diarrhea. 3. Viral infection: If the mother has diarrhea due to viral infection, such as rotavirus, which is often accompanied by abdominal pain, diarrhea, and yellow watery stools, this condition can easily be transmitted to the baby, leading to diarrhea in the baby. Nursing mothers with diarrhea, if the dietary factors are not relieved, should consult a doctor in time, under the guidance of the doctor to take appropriate measures to prevent the baby.