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They are being advised to adopt the 'play-pod' model in order to limit the number of people children interact with.
The maximum size of a 'play-pod' will be confirmed in the coming days.
While initially the services were only due to open for children of essential workers, this has now been widened to include other categories.
Children's Minister Katherine Zappone says it is not clear yet how many will be able to open in the summer.