The 3 month old baby has mucus in the stool, it may be that the baby is lactose intolerant, or there may be a gastrointestinal dysfunction or intestinal infection. Parents should combine their children’s other symptoms for a comprehensive analysis. 1, lactose intolerance: the sugar in breast milk and cow’s milk is mainly lactose, if the child lacks the enzyme to break down lactose, there can be mucus in the stool. Parents should check whether the child has lactase deficiency, and if necessary, give the child lactase, or switch to other milk powder, such as low-lactose milk powder for feeding, to alleviate the situation of mucus in the child’s stool; 2, gastrointestinal dysfunction: If the baby’s stool mucus is not a lot, and good appetite, no nausea, vomiting, bloating and other symptoms, no special treatment is needed, it is possible that the baby has a slight gastrointestinal dysfunction It is possible that the baby has a slight gastrointestinal disorder. At this time to pay proper attention to warmth, avoid abdominal cold, avoid feeding the baby too much milk; 3, intestinal infection: if the baby’s stool mucus is more, or stool more often, accompanied by diarrhea, pay attention to whether the baby has symptoms of indigestion due to intestinal infection, common enteritis, gastroenteritis. It is best to go to the hospital to check the stool routine. If the stool routine shows an increase in white blood cells, it suggests an intestinal infection. To take antibiotics under the guidance of a doctor for reasonable treatment, in addition to taking antibiotic medication, you can also give your baby intestinal probiotics, such as small Pepcid or Lactobacillus to relieve symptoms; 4. Other: In addition to mucus, if the baby stool with blood or blood, you need to consider the presence of foreign bodies in the esophagus, acute gastritis and other diseases, you need to follow medical advice for treatment, so as not to delay the child disease.