According to results of a survey from 2010, only 5 percent are refusing some of the vaccines, while 2 percent are saying no to them all together.
About 38 percent were concerned about vaccines being painful and more than one-third think babies get too many in a single visit. Some parents believe vaccines cause fevers or learning disabilities such as autism. And 26 percent think they're unsafe.
Details of the report are in the monthly journal Health Affairs.