When seven-month-old babies have diarrhea and impaired spleen and stomach after changing milk formula, medicines such as Bifidobacterium tetrapunctate tablets can be used under the guidance of professional doctors. Seven-month-old babies should be gradually transitioned when changing milk powder, otherwise it is easy to lead to diarrhea. Diarrhea is mostly caused by indigestion, and probiotics can be given as prescribed by the doctor. Common probiotics include Bifidobacterium bifidum tetragonum tablets, Bacillus licheniformis capsules, Bacillus subtilis bifidus granules, and so on. If diarrhea persists after changing milk powder, it is recommended to stop using the new milk powder, or control the number of times of feeding milk powder every day, and increase complementary food appropriately. If the above situation occurs, it is recommended to consult a doctor in time and be guided by a professional doctor for appropriate treatment.