The vaccination question is a tough one for many parents. Here are some web sites I used that helped me make my decision: 909shot.com - this is the national vaccine information center
http://www.vaclib.org/exempt/pennsylvania.htm - PA exemption information - you DO NOT need to vacinate your child so they can go to school & this site gives you the information needed to provide proper documentation for admittance
http://www.gentlebirth.org/archives/newhepb.html - HepB info
http://www.larkfarm.com/AP/vaccination.htm - info from another parental source
http://www.larkfarm.com/AP/immune.htm - info about how the Immune System works
http://www.vaclib.org/legal/refuselt.htm - Vaccine Liberation
Also check out mothering.com - Mothering Magazine is a great source of info on many topics
You can see the Center for Disease Control's web site will also have lots of info but it will be similar to what is handed out in your Docs office.
Here is an except from an editorial on vaccinations by Peggy O'Mara of Mothering Magazine:"Choosing whether or not to have a child vaccinated, especially in light of the politics of vaccines, must be an independent decision. It should not be coerced, but be the product of true informed consent. Few people even know that they have a choice regarding vaccinations, much less know what informed consent really is.
In fact, all 50 states grant medical exemptions to vaccination. All states except Mississippi and West Virginia have religious exemptions, many of which are written broadly. An increasing number of states also have philosophical exemptions: Arizona, California, Colorado, Idaho, Louisiana, Maine, Michigan, Minnesota, New Mexico, Ohio, Oklahoma, Texas, Utah, Vermont, Washington, and Wisconsin. More recently, California, Delaware, Illinois, Iowa, Missouri, and New York have banned the use of thimerosal in vaccines, and bans in many more states are in process. Representatives David Weldon (R-FL) and Carolyn Maloney (D-NY) have introduced a national bill to ban thimerosal in all US vaccines.
Some parents want to comply with the entire vaccination schedule; others want no vaccinations at all. Some parents want certain vaccines but not others. And some want to delay the vaccines until their baby is older. These parents will all need written exemptions from their state health departments, even though exemptions are technically designed for those who choose to forgo vaccines altogether."
Read everything you can get your hands on. Read both sides of the argument and then MAKE YOUR OWN decision. This is your child, your family, and if something does go wrong it will be you taking care of your child and taking the brunt of any critisism because of your decision.
I hope this helps. If you have more questions ask again and again. Your child will still be there and it's ok to wait until you feel really good about your choice. Good Luck to you and your child!