Roedd deddfu i gael gwared ar amddiffyniad cosb resymol yn un o ymrwymiadau'r rhaglen lywodraethu, sydd wedi'i ategu yn strategaeth genedlaethol Ffyniant i Bawb.
Legislating to remove the defence of reasonable punishment was a programme for government commitment, which has been reaffirmed in the national strategy Prosperity for All.