It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
This link contains information about how vaccines work, how they help babies, and the ingredients in them. It also talks about what happens if you do not get a shot/vaccine.
This link talks about the importance of everybody receiving a vaccine. It contains some brief historical information about the lack of vaccines in the past.