There's so much fear based belief about vaccines. I used to have the doctor administer the absolute minimum amount for each one. There is such a thing. I lost the battle with the school board over non-immunization. Long story.
Of the autistic children I know: a close friend's daughter and a nephew...it doesn't appear that it is caused by vaccines, that it is a genetic or chromosome basis...DNA.
Ask the pediatrician to sit down for a conference, or refer you to a specialist and get into a support group for reassurance. What you see/read on the internet is like looking at the news/paper...it's whatever anyone chooses to report.