It's toxins
To respond to the comment above on vaccines, this list of toxic chemicals is long overdue, but be aware that the vaccines also contain many toxins and heavy metals. Toxic overload is often the issue. Couple an overload of these items with lack of nutrients (raw material for body machinery), and you may have a person whose "body machinery" may not excrete the toxins well, so they build up and some last insult pushes the child over the brink, .
Too many parents and grandparents have literally "watched the lights go out" in their child even only a couple of hours after a vaccination to ignore these obvious concerns. No amount of misplaced and false intellectual assurance of the inherent safety of these toxic injected soups is effective in those frequent situations.