I found this from PubMed from 2001:
Predicted mercury concentrations in hair from infant immunizations: cause for concern.
An excerpt...
[According to the centers for disease control (CDC) recommended immunization schedule, infants may have been exposed to 12.5 microg Hg at birth, 62.5 microg EtHg at 2 months, 50 microg EtHg at 4 months, 62.5 microg EtHg at 6 months, and 50 microg EtHg at approximately 18 months, for a total of 237.5 microg EtHg during the first 18 months of life, if all TMS-containing vaccines were administered.]
http://www.ncbi.nlm.nih.gov/entrez/q...&dopt=Abstract
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