In 1796, Edward Jenner inoculated an 8-year-old boy against smallpox and coined the term "vaccination" to describe what he had done.  Today, smallpox is a memory thanks to vaccination, and routine vaccination against childhood diseases  id an important part of our children's health care. As parents we want to do everything we can to keep our babies from getting sick. In this booklet you will learn more about the role vaccines play in keeping them healthy.  You will learn about:   Diseases that are prevented by vaccines, and the vaccines that prevent them.   How to prepare for a doctor's visit that includes vaccinations, and what to expect during and after the visit.   How vaccines help your baby's immune system do its job.   What is in vaccines, how well they work, and how safe they are.   Where to find more information.