I don't know where you reside but on the UK's NHS site an article, made by Public Health England, has this to say:
A 5-in-1 vaccine is not half that.
The main thing is though that those that are ill at the same time as given a vaccine could have been ill anyway without it; the very small % of adverse events recorded fall within the boundary of them being pure coincidence. You have to bear in mind there are many millions of these vaccines given every year (10 million in the US alone), so it's not hard to see that at least some children will fall ill at the same time as having it. The odds are relatively high, especially the really young ones, of falling ill independently because their immune systems are still adapting to their environment and threats not yet encountered by them or other adverse events they are uniquely predisposed to, genetically for example, that happen to be expressed at that time. What I've posted here is a distillation of past discussions on the subject on SFN - you might want to search.