Kids staying masked inside classrooms is ‘reasonable’ for a period of time, former FDA chief saysParents of children under 12, who are not yet eligible to be vaccinated against the coronavirus, will have to continue to make individual assessments about their risk, said Scott Gottlieb, former commissioner of the Food and Drug Administration — even as officials cheer the steady decline in COVID cases in the United States and the return to relative normalcy for many vaccinated adults.