So, you're concerned about what you take in through your mouth, which has no direct contact with your blood, and can only be absorbed into the blood through a variety of processes, but are happy to pump an unknown cocktail of chemicals and viruses directly into your baby's bloodstream?
What do you think rebel's wife found out? That no-one knows the contents of the vaccine. That's how the SV40 virus became so widespread in the human population, as the polio vaccine was cultivated from monkey tissue. Nobody even knew that this virus existed at the time. Although govt. departments maintain that it is safe, it has been linked to many types of cancer. In spite of it being "safe" the FDA ordered its removal from the vaccine (which the manufacturers initially ignored), and a new, safe vaccine has been used since 1999.
They don't know what is in the shot. Next time one of your kids get's an injection, get the doctor to read to you the safety sheet first. There is one with each phial of vaccine.