The Food and Drug Administration set tentative dates in June to publicly review COVID-19 vaccines for the youngest American children, typically the final step before authorizing the shots. The meeting announcement Friday follows months of frustration from families impatient for a chance to vaccinate their little children, along with complaints from politicians bemoaning the slow pace of the process. The FDA said it plans to convene its outside panel of vaccine experts on June 8, 21 and 22 to review applications from Moderna and Pfizer for child vaccines. The dates are not final and the FDA sai…