We vaccinated my son at birth, and I really wish we had waited. He had no bad reaction, and was wonderful and healthy and had no issues at all, but I felt pressured into it by the hospital, and after doing the research, I was really quite angry. It was an unnecessary thing to do at that age, and in fact, the amount of aluminum in the vaccine is higher than is recommended even for older children. Most children can process the aluminum and flush it out of their systems, but I still think the baby's very first birthday is a scary time to try to find out. With my second child, we will wait a while to give this vaccine. I recommend you read Dr. Sears' "The Vaccine Book," which goes into detail about the ingredients in this particular vaccine and the risks for and against it.
Just as a side note, not everyone who is concerned about vaccines thinks they cause autism. Many of us are more concerned about the other ingredients in the shots, as well as the shocking LACK of safety studies done on vaccines. No matter what you choose, there may be risks involved, but do your research and then stick to your guns. Good luck!