The baby’s diarrhea is rotten egg smell is mainly due to cold, food, indigestion, bacterial or viral infection, can be treated by adjusting the diet and medication, usually good prognosis. 1, cold: cold can lead to baby gastrointestinal dysfunction, abnormal digestive function, which can appear diarrhea, the stool is rotten egg smell phenomenon. The baby’s abdomen can be relieved by way of warmth and hot compresses, such as hot water bags, pay attention to the temperature to not hot hands; 2, food: food in the intestinal tract for too long leading to abnormal fermentation, resulting in too much ammonia, can cause diarrhea, stool smells like rotten eggs. Usually should pay attention to reasonable feeding, avoid overfeeding, add vegetables and fruits to complementary food appropriately, supplement fiber, promote intestinal peristalsis, relieve the symptoms of discomfort; 3, indigestion: due to abnormal digestive function, resulting in abnormal intestinal balance, causing diarrhea, stool smells like rotten eggs symptoms. Babies are advised to eat less and more meals and avoid excessively greasy supplementary food. If the diarrhea is serious, oral montelukast can be taken under the guidance of a doctor to stop the diarrhea, and attention should be paid to observe the baby’s mental state and drink more water to prevent dehydration; 4, bacterial or viral infections: bacterial or viral infections can lead to an imbalance in the intestinal flora, which causes diarrhea and rotten egg-smelling stools. Routine stool examination should be carried out, and if the diagnosis is bacterial infection, antibacterial drugs should be used for treatment under the guidance of a doctor. If the infection is viral, antiviral medications such as pediatric black bean paste and fever granules should be used as prescribed by the doctor, along with combined rehydration therapy.