Although the available COVID-19 vaccines are not yet authorized for children under age 12, Massachusetts health officials are getting ready as the population of over 880,000 minors is anticipated to become eligible for the jabs, potentially later this year. Pediatric practices and school vaccination clinics are two of the major avenues state leaders are eyeing for the rollout of the vaccines to the commonwealth’s youngest residents, state Secretary of Health and Human Services Marylou Sudders said Monday. Emergency use authorization for vaccines for children under 12 from the Food and Drug Administration could come this fall, Sudders said, or by midwinter, as one agency official told NBC News earlier this month.