Infant pneumonia has bacterial infections, viral infections and mycoplasma infections, most of which are bacterial infections, and their medication is determined by the type of pathogenic bacteria as follows: 1. Streptococcus pneumoniae infections: penicillin plus amoxicillin; 2. Staphylococcus aureus infections: Benzoxazole penicillin is preferred for those who are sensitive to methicillin, and vancomycin is used in the opposite case; 3. Staphylococcus infections: amoxicillin; 4. Mycoplasma infections: Achille’s disease and other infectious diseases. The first principle of antibiotic treatment for pneumonia is to use the first antibiotic in the first place. Pneumonia antibiotic treatment principle is first of all early, adequate amount; second is to choose in the lung tissue concentration of higher species antibiotics; severe pneumonia is advocated for intravenous co-drugs.