For MMR, I was worried as we have ASD in the extended family. I read about it a lot and did look at some original research. i saw plenty of scientific research suggesting no link between MMR and autism, that I found convincing - but also parents' group sites and blogs that had a basis on which to attack every single study, eg in Japan they stopped doing MMR and did single jabs and found no difference, but the critics claimed the jabs they did were still to close together. And so on and so on.
I still think that, if you measure the whole population, even if MMR only affects a few particular children who are susceptible to a "trigger", rates of ASD would be higher in children who have had MMR - and it doesn't seem to. In fact in one study they were slightly lower though not to a statistically significant extent. That is convincing, but OTOH I'm aware of historical precedents of cover-ups and skewed/faked research, so I know it's possible. After all this I wasn't surprised when our GP and HV were extremely neutral and reserved on the matter and said they couldn't make any decisions for us. Presumably if they say "yes get the vax" and then any adverse reaction happens at all, they're scared they'll get complaints, even though there are always a few bad reactions and always have been.
Soooo, on reflection we have gone for all the available vaccinations. We are basically sciency at heart I think and the rise of measles is a factor. One of DS's friends got it and that did put the wind up me.
One thing I really still can't understand though re MMR. Wakefield - putting aside aspersions cast on his methods and interests - found measles in the guts of children who had had MMR and who had ASD regression problems and bowel problems, as I understand it. I just don't see how that leads to doubts about MMR. Surely everyone could have measles in their gut whether they have MMR or a single jab, and whether they have ASD and/or gut problems or not. Couldn't they? What does it show? I can't see how it shows anything at all. I may have misunderstood it but if the measles virus is the issue, what's that got to do with MMR as opposed to single jabs?