Most pediatric vaccines, with the big exception of flu shots, are now thimerosal free. This chart shows which vaccines still have "trace" amounts of mercury (0.3 mcg), indicated by the * with the underline.
http://www.vaccinesafety.edu/thi-table.htm The full amount of mercury is 25 mcg. Don't be fooled by the .01% in the thimerosal column. That looks like a small amount, but move over to the mercury column, and it translates to 25 mcg mercury.