Diarrhea and belly rumbling during breastfeeding are caused by indigestion due to gastrointestinal dysfunction caused by cold in the abdomen. It is recommended to go to the gastroenterology department of the hospital for routine stool examination to confirm whether the diarrhea is caused by indigestion. After the diagnosis, take montelukast or Bacillus licheniformis capsules under the guidance of the doctor. During the treatment period, you should pay attention to rest and avoid straining, and keep your abdomen warm to avoid getting cold. If the diarrhea is severe, you should cooperate with the doctor to replenish body fluids and electrolytes by infusion to avoid electrolyte disorders, and eat less and more meals, avoid spicy, stimulating and cold foods.