A one-month-old baby with diarrhea is often caused by indigestion or maternal dietary inattention. At this time, you can give your baby a hot compress on the abdomen and an abdominal massage, and you can also give your baby Mamie’s Love or probiotics to regulate the imbalance of the baby’s intestinal flora. If necessary, you can add montelukast to strengthen the astringent antidiarrheal treatment. The baby should be breast-fed, and the mother must pay attention to avoid greasy, spicy, irritating food, to easy to digest, semi-liquid diet.