The European Medicines Agency has decided to approve the COVID-19 vaccine Comirnaty (BioNTech/Pfizer) to include use in children aged 12 to 15. Poland will offer COVID-19 vaccinations to children aged 12-15 from June 7, 2021.
https://www.ema.europa.eu/en/news/first-covid-19-vaccine-approved-children-aged-12-15-eu