If a vaccine was given at 1.5 years instead of 2 years, is that okay?

Depends: this depends on: -what vaccine was given -whether it was the first dose of a series - how long a period of time had it been between doses if it was within a series. If you have a question about a specific vaccination timing for your child, discuss it with your pediatrician or re-ask with vaccine name and date(s) given for whole series.