1. What is infant vaccination? 2. Why is infant vaccination needed? 3. What diseases require infant vaccination? 4. How to vaccinate infants? 5. What precautions need to be observed? 6. What are the common side effects? 1. What is infant vaccination? Infant vaccination refers to the injection of a certain amount of a specific pathogen or its components into the human body to promote the body\’s immunity to the pathogen.