I am asked often if there is a link between autism and vaccines. Autism symptoms usually start to be more prominent around 12 to 18 months, around the same age when some vaccines are administered for the first time.
(Here’s a vaccination schedule from the American Academy of Pediatrics:
http://www.cispimmunize.org/IZSchedule_2006.pdf
Here’s an interesting website regarding studies on the relationship between autism and vaccines: