As predicted back in September the, FDA, CDC and Fauci lied about boosters and have reduced the wait from six or eight or more months to five months.
Perhaps they are not following the data and the science, but it was clear back in July, August and September that 8 or even 6 months was too long and the shots were failing to provide protection.
With omicron, there are a lot of breakthrough cases even after 2-3 months post booster even though the President was lying today about it being a pandemic of the unvaccinated.