Five years ago, Kathye Petters-Armitage's first child received the exact vaccinations on the exact schedule recommended by her pediatrician.
But when she gave birth to her second child, Petters-Armitage had a change of heart.
In the intervening two years, she'd read a lot about concerns that vaccines cause autism and decided to ask her pediatrician to give her new baby fewer shots spread out over a longer period of time.
"I wasn't a hundred percent convinced there was a link between autism and vaccines," said Petters-Armitage, of Santa Clarita, California. "But I didn't want to be one of those parents who found out the hard way."