One of the biggest reasons people think it causes autism is because most of the major signs of it start showing up around the same time most people start giving their kids shots.

Autism itself is a VERY broad term used to cover a massive amount of different disabilities. (Example: ADHD, Aspergers, Bipolar, ADD, and many many more)

I know this because I take care of special needs twins as a foster parent and I am neck deep in all of this. They both have a spectrum of Autism but are completely different even though they are twins.

It begins when parts of their brain are not developed properly in the womb. Being both born at 24 weeks one had cerebellar atrophy while the other had slight bleeding in the brain which caused him to have seizures and lack of oxygen to the brain.

We knew there was going to be some complications but they didn't start showing themselves right away. But sometimes the signs show up immediately after being born.

Right now one of the leading causes of Autism is underdevelopment from premature birth, drinking during pregnancy, complications during pregnancy. It all comes down to development.

The younger people start having kids the more chances they will have those complications and right now in this era teens are having babies left right and center and think they can still live like a teenager.

In closing if you think a simple needle is instantly going to cause Autism you're a fool.