The Welsh Government wants to introduce fixed penalty notices for persistent truancy from 1 September.
It has published responses to a consultation which ended in February.
Education Minister Leighton Andrews put forward last November his plan for fines of up to £60 for the parents of children who regularly miss school, rising to £120 if not paid within a month.
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The WRU said its new policy is in the 'best interest for players, the regional game and national side'.