Given that the vaccine itself is out of your system within a few days, and if effective begin triggering an immune response, I don’t think there’s not much reason to monitor for safety beyond that point.
That's exactly what the parent commenter said. Your children are affected, but your first grandchildren should be safe.
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.
Remember when it was claimed the spike protein is out of your body in 48 hours? This study found the spike protein persists in the body for at least 16 days and the antigen can be found for at least 60 days.
https://www.cell.com/cell/fulltext/S0092-8674(22)00076-9
Thats longer than if you actually contract COVID.
So now knowing this, would you monitor for safety longer?