Pupils aged three to seven will be back at school from 22 February, along with some older children on vocational courses in Wales.
However, Education Minister Kirsty Williams said Wales is “not yet in a position” to allow all pupils to return to school.
Teaching staff will now be tested twice weekly for Covid-19 & £5m will be spent on face coverings and other equipment.
Ms Williams added: “I must be absolutely clear: we are told time and time again that our education premises are safe, but it is the added movement around them that contributes to the R number.
“So I must make a plea to all learners, parents and carers, please continue to follow the guidelines.”
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