Three months baby stool rare sour odor may be associated with improper feeding, gastrointestinal dysfunction, can be adjusted through the feeding mode, medication, etc., usually strengthen the baby’s care. 1. Improper feeding: feeding the baby irregularly, feeding too much at a time will increase the burden on the stomach and intestines, indigestion, causing rare acidic odor of the stool, you can adjust the feeding method, regular and quantitative breastfeeding to the baby, should not feed the baby too full, you can alleviate this situation. 2. Gastrointestinal dysfunction: If the baby’s abdomen is cold, it will cause gastrointestinal dysfunction, the symptoms of rare acidic odor of stool, you can use probiotics under the guidance of the doctor to adjust, such as Bacillus subtilis bacillus granules, pay attention to do not use for a long period of time, so as not to cause diarrhea and other adverse reactions. Finally, parents should strengthen the care, to avoid the baby’s abdomen is cold. It is recommended that the three-month-old baby stool rare sour odor timely to go to the hospital for examination to identify the cause of targeted treatment. The above medication should be used under the guidance of a doctor.