If you do have vaccines coming up and want more information, reading the manufacturer's package insert is the best way to get honest date. Here is a list of all the inserts - you'll need to ask your Dr which specific brand they use for each vaccine. This is one of the things that helped me the most.
For example: by reading the inserts I learned that with the DTaP, if you spread out the first 3 doses so that the 3rd dose is given after a year old, then they dont need a 4th dose. So thats one way to save them a vaccine. I believe its the same for some of the other vaxes as well.
You will find reaction and effectiveness rates there as well and that can help you weigh your choices.