A picture of my grand-niece.
This is horrid, but I recommend that you watch it.
The next is anecdotal and from my experience, not a study and not truly empirical evidence of anything: I come from a family of five children, all who got every vaccination and innoculation known to man because we were Army brats. We experienced no ill effects, and neither I nor my siblings ever suffer as much as the general populace when colds, Flus, and other ailments make the rounds. We either don’t get sick at all, or our recovery is quicker than average and symptoms less stressing.
Mime jokes aside, Lamar Alexander gets things right in this video even though I disagree with him on some other topics (notably TRACS.)