Actually we have made an educated decision(have several family members with PhDs in Pharm/medicine) not to load our children down with "vaccinations" So far we have raised 2 teens that have never had to see a doctor for any illness. By the grace of God go I....but we don't live in fear of every disease. Maybe you have "faith" in the system that is telling you to drag your child in to get their "shots" but I have a different perspective
The only reason your children didn't get sick with something, such as measles, is because of the vaccination rate in the USA, which has all but wiped out many childhood diseases. So, if your children have made it through to adulthood without the childhood diseases that were quite common when I was a child, before all the vaccinations, then you need to thank all the parents who DO have their children take their shots, because they are the reason your children haven't gotten sick.
I speak from experience, every friend of mine when I was growing up, contracted measles, mumps and whooping cough at the very least(both types of measles, BTW). That doesn't happen today thanks to modern medicine and the research that led to the vaccinations that have all but wiped out these illnesses.