The poster I responded to wrote: "Thalidomide is out of your system by your first grandchild." Actually, Thalidomide is out of your system within days. Quite a bit less time than it takes to have a grandchild.

The poster implies that there could be unknown long term effects of a vaccine, and conflates long term effects with birth defects, which, of course, appear only after a fetus has developed enough to spot defects in a sonogram or other imaging. It's a scare tactic.