Schools have been urged to prioritise vulnerable pupils and use online learning to stop children falling behind during the strikes, in a return to lockdown-style learning.
Teachers in the National Education Union (NEU) will strike for seven days between February 1 and March 16, affecting up to 23,400 schools in England and Wales.
The number of strike days in any given region will not exceed four.
However, experts and charities said that they could set back the learning of children who had already lost out during the pandemic, especially if the industrial dispute drags on into future academic years.
