I think a lot of suspicion has been put on the MMR shot because that shot is given at a time when kids start showing signs of Autism. Per my pediatrician in CA, Thimerosol (the Mercury component), has been removed from all children's vaccines in the state of California. You might want to check with your particular state.
I certainly don't know anything 100% but I am also hesitant about the vaccination schedule. I believe what everyone else says, it is good for the the general public for everyone to get vaccinated, BUT what if it's not good for you? What if your child is the one with the bad outcome?
I had my daughter receive all of her vaccinations eventually but I didn't let them give her them as quickly as they advised. NY has a very aggressive vaccination schedule. On one visit, they wanted to give her five vaccines. I opted to space them out more. For the most part, nothing bad ever happened, but there was one time after I think her 4th or 5th shot of a particular vaccine that she freaked me out because she woke up crying and cried for two hours and walked around with her head crooked to the side. It was very strange and there was never an explanation, but she's clearly fine now.
I've also heard the argument that why is it a one size fits all? Why do they want to give every child the exact same shot at the same time regardless of their size? That makes me uncomfortable. Luckily I'm not as concerned with my son because he's so big, but with that said, my pediatrician in CA seems more than happy to let me space the shots out longer than they're told to give them.
I know nothing has been proven, but I certainly don't trust this vaccines 100%. I certainly don't think a pediatrician would purposely do something to hurt a child, but there is still a lot they don't know. Look at the cold medicines that everyone has been giving their kids and now they're not recommending them anymore because A) they don't work and B) children have died from them.
With that said, Adrian (my son) will get all of his vaccinations eventually, but I prefer a much slower approach. Sometimes I think the doctors just want to do them quickly because they worry that a lot of parents might not ever show up for the next appointment and end up never getting the shots.