There are many studies for and against immunizations. My own pediatrician suggested that there has been such extensive research concluding that vaccinations does not cause autism that the government will not likely fund any further study on the matter.
Here are two recent yet opposing views on the matter. Read and draw your own conclusions
http://www.cnn.com/2011/HEALTH/01/05/autism.vaccines/index.html
http://canaryparty.net/index.php/the-news/123#.ULlTzchfCBM.facebook
It's your birth and your choice.