Babies need to pay attention to ensure that the body is healthy before vaccination, after the vaccination should pay attention to the observation of half an hour, as far as possible not to take a bath, light diet, ensure rest. 1. Before injecting the vaccine need to have a healthy body, in the respiratory tract infection or gastrointestinal infection attack period, the body skin rash and other cases should not be vaccinated. 2. Half an hour of observation is required after vaccination, in general. Adverse reactions to the vaccine will appear within half an hour, observe half an hour without abnormalities can leave. 3. Within 24 hours of vaccination, the needle eye has not healed, so try to avoid bathing to avoid infection. 4. Within three days after vaccination, ensure a light diet, ensure rest, do not overdo exercise. Specific precautions for infants before and after vaccination, you can consult a professional physician’s opinion.