Babies with sour and mucusy stools are usually due to protein indigestion or intestinal bacterial infection. Parents should observe the infant’s bowel movements, if accompanied by other abnormal discomfort, should promptly go to the hospital for examination, to clarify the cause of symptomatic conditioning. Common causes 1, protein indigestion: infants’ staple food is breast milk or milk powder, in which protein molecules are relatively large, absorption, digestion is more difficult, so infants eating milk powder are prone to protein indigestion, poop out of a sour smell, and there is mucus; 2, bacterial infection: under normal circumstances, infants’ stools are soft and golden yellow in color. If the phenomenon of sour smelling stools with mucus, accompanied by diarrhea, vomiting, fever, etc., may be due to bacterial infection resulting in gastroenteritis. Solution 1, formula feeding easily lead to protein and fat should not be digested, it is recommended that usually pay attention to the appropriate amount, if necessary, under the guidance of the doctor with probiotics to improve conditioning; breastfeeding, the mother’s diet should pay attention to light, avoid eating cold, greasy, stimulating food; infants supplemental food to add attention to easily digestible food, can also consider eating hydrolyzed formula; 2, for the symptoms of gastroenteritis For infants with symptoms of gastroenteritis, parents can give anti-inflammatory drugs under the guidance of a doctor, supplemented by intestinal regulating drugs such as spleen health and bifidobacterium trituberculosis for treatment. Parents should pay attention to the nature of the infant’s stool, if the abnormal color and odor persist without relief, or the infant is accompanied by crying, fever and other abnormalities, should promptly take the infant to the hospital for routine stool examination to clarify the cause.