Breast fed infants ingest about 7 milligrams. But about 99.75% of that goes straight into the poop, as the dietary system is incredibly good at not absorbing dietary aluminum. By contrast virtually all of the 4.4 mg of aluminum they get injected from vaccines eventually makes it to their systemic flow. That results in a total load of aluminum entering the blood from diet of .0025*7mg= .01 mg compared to the 4.4mg of injected aluminum reaching their system. Or in other words, the ratio of aluminum reaching the blood from vaccine is about 250 times the amount reaching the blood from diet.
Better read the fine print or they will pull the wool over your eyes. See also http://www.ncbi.nlm.nih.gov/pubmed/20010978 for some measurements.
But I want to commend you polymathwannabe. You are the first reply I have gotten that attempted to engage any meaningful question.
The article you cite says,
This study does not dispute the safety of vaccines but reinforces the need to study long-term effects of early exposure to neuro-toxic substances on the developing brain.
The toxicity of Al is much lower than that of thimerosal
Mild post-vaccine symptoms in young infants, especially neonates, are non-specific and considered tolerable; rare (neurologic) adverse effects are unlikely to occur as a result of adjuvant-Al per se or in combination with thimerosal-Hg.
From the article I didn't gather what type of exposure was more worryi...
For example, what would be inappropriately off topic to post to LessWrong discussion about?
I couldn't find an answer in the FAQ. (Perhaps it'd be worth adding one.) The closest I could find was this:
However "rationality" can be interpreted broadly enough that rational discussion of anything would count, and my experience reading LW is compatible with this interpretation being applied by posters. Indeed my experience seems to suggest that practically everything is on topic; political discussion of certain sorts is frowned upon, but not due to being off topic. People often post about things far removed from the topics of interest. And some of these topics are very broad: it seems that a lot of material about self-improvement is acceptable, for instance.