A new campaign group of Welsh academics says the prohibition should be enforced quickly, and that only a small change is needed.
However the Government says “extensive consultation” would be required before any such move is made.
Critics of a ban on smacking say such a move would criminalise loving parents simply seeking to discipline their children.
In February an amendment to ban smacking was rejected by Welsh Assembly Members, as they debated the Social Services and Well-being (Wales) Bill.
At the time Deputy Minister Gwenda Thomas signalled there would be opportunities to “examine this issue” before the 2016 election.