More or less that vaccinated children do not have lifetime immunity. They also won't have immunities passed on from their mother's breastmilk because that mother also relied on vaccines. Already within one generation we have gone from a one dose MMR vaccine, to a two dose and now a three dose vaccine given at various stages in life.What exactly do you mean by this?
Vaccines haven't been around that long. (although they did have a crude form in ancient days) How do we know that each generation doesn't pass on an increased immunity to the actual vaccine?