All schools in England are going back from 8 March.
In Scotland, younger primary pupils have gone back to school, along with some exam-year students in secondary school. A wider reopening has yet to be decided.
In Wales, younger primary years have also returned – with older primary pupils set to go back on 15 March if Covid levels continue to fall.
In Northern Ireland, younger primary pupils will return to classrooms on 8 March.
But how likely are children to catch and spread the virus?
BBC’s Health reporter Laura Foster explains what we do know currently about how children are affected by the virus.
Video by Laura Foster, Terry Saunders and Tobias Chapple.