Maybe some people might find this link interesting:
http://www.pathguy.com/antiimmu.htm
Breastfeeding does pass on some immunity but not indefinitely and not equally well for everything. For instance, whooping cough is one thing for which not much immunity is passed on that way, as I understand it.
I'm a parent too, and I have worries about vaccination in that some people can have bad reactions, and obviously I worry in case one of my children might be one of those people. I don't trust big pharmaceutical companies, but I don't really trust antivax websites in general either because they seem to be so rigidly pushing a huge conspiracy theory, and seem to be so extremely anti critical thinking and rational evaluation of evidence. There is a lot of disinformation. I also find sweeping statements about how homeopathy has more effective cures for anything and everything, vaccination 'destroys' the immune system, etc. quite offputting, whatever the faults of mainstream medicine etc.
Fwiw, my second child is about to have his first vaccinations, almost certainly (I'm concerned about the idea that there could be a lot more whooping cough about in the adult/older child population than has been previously thought). He probably won't have the pneumovax at exactly the same time though - we'll probably delay that a bit. We may still delay his first vaccinations themselves, too. I definitely wouldn't say vaccines shouldn't be questioned or that we as parents don't have a duty to question what we're told and whether we should do things exactly as told, but I don't buy most of the conspiracy-theory-driven stuff on antivax websites.
Re the MMR booster, my eldest child had a fever about two weeks after that, which we think could have been down to that as no one else in the house got it. With hindsight, I wish we'd postponed it till he was completely over a cold he had - generally people seem to say it's fine to have jabs with a cold, just not with a fever, but I think it's probably better to wait till even a cold has gone. But once he was over it he was fine. Incidentally that preschool booster is the MMR booster plus a DTP booster - ideally I hadn't wanted him to have both on the same day, although he did in the end, but it could be worth spreading them out a bit, perhaps?
Overall with vaccines, some people who have them are going to wish they hadn't, because their child will have a reaction. Same goes for bad cases of the illnesses though. The bottom line is there is no guaranteed safe option, which makes it really difficult as a parent because you feel so responsible for the consequences even if they're not forseeable. Hope you can come to a decision you're happy with.
Btw this is my first post, I came here after searching for Onya bags, great website, will introduce myself properly later!
) before I was, or at least I assume I am as when my children had it I didn't catch it!