Baby diarrhea has been bad may be related to enteritis, indigestion, lactose intolerance, etc., can be treated by anti-infective drugs, the application of probiotics, replacement of milk powder and so on. 1. anti-infection treatment: if the bacterial infection caused by enteritis, need to apply cephalosporin or penicillin antibiotics for treatment; if the viral infection caused by enteritis, usually has a certain degree of self-limitation, generally take symptomatic treatment, such as rehydration to prevent dehydration, the use of montelukast to stop diarrhea, and so on. 2. Consumption of probiotics: baby diarrhea has been bad may be caused by diet, improper care caused by indigestion, it is recommended that the use of bacillus subtilis and other probiotics and other drugs. 3. Replacement of milk powder: lactose intolerance may also lead to baby diarrhea has been bad, you can change the milk powder under the guidance of the doctor. If the baby diarrhea has been bad or accompanied by other symptoms, it is recommended to go to the hospital in a timely manner, the drug should be used under the guidance of the doctor, avoid taking private.