4 months baby diarrhea, if the yellow paste, no other discomfort, may be a normal phenomenon, no treatment, if the watery stool, mucus stool, blood stool, etc. often for gastroenteritis, need to increase the number of breastfeeding rehydration, follow the doctor’s instructions to use medication and other treatments. 1. Normal physiological phenomenon: 4-month-old baby, if exclusive breastfeeding, due to the breast milk in the food residue is small, the stool is mostly paste, golden yellow, may be many times a day, and even with the anal exhaust with stool, is a normal phenomenon, the baby’s spirit, the amount of milk, the body temperature is normal, without special intervention, with the baby digestion and absorption enhancement, the number of stools will gradually decrease. 2. Gastrointestinal infections: if the watery stool, mucus stool, blood stool and other cases are abnormal stool, accompanied by fever, vomiting, stools increased significantly, the baby may have enteritis, if the baby’s symptoms are mild, parents can increase the number of breastfeeding to supplement the water, but if the number of diarrhea is more, the need for timely medical treatment, the use of montelukast diarrhea and other treatments. Therefore, 4 months baby diarrhea, parents need to combine the baby’s condition, spirit, milk, body temperature and other conditions to determine, if necessary, timely medical treatment. The above medications should be used in accordance with medical advice.