Read what I wrote, its the NUMBER of vaccines given to an infant that can overwhelm the immature infants system..I did NOT speak of the “stuff” as you put it, that is in the vaccine. What I said is obiviously not what you read. Try again to read my first sentence..
OK, let's try this. The active ingredient in a vaccine is a antigen (actually proteins and polysaccharides). That is the thing that activates the child's immune system. So that is what you feel "overwhelms" the system.
That said, it is worth looking at the total number of those antigens in the vaccine schedule. You see, vaccines are always being improved. It is now the case that the total number of antigens in the vaccine schedule (around 130) is less than the old Smallpox vaccine alone (200) and much lower than the total in 1980 (over 3000!). So it is clear that we are not overwhelming the immune system with the number of vaccines given.
Hope this helps.