You hid all the actually relevant information under "etc, etc". If his reactions to the shot was a fever and heat at the injection site, those are very typical reactions that don't necessarily suggest anything else.

Saying he had a dramatic change "after the shots" is an example of post hoc ergo propter hoc. It isn't even evidence of causality, much less justification for believing causality.

"When these little babies have 3 and 4 shots at one time it truly pushes too many chemicals in their bodies." Whether that's true or false, it doesn't justify a belief that a particular thing happened to a particular person. We know smoking increases your risk of cancer, but that doesn't let us say that for a particular person who smoked and then god cancer one caused the other.