Bydd y Bil yn cael gwared ar amddiffyniad cosb resymol o'r gyfraith gyffredin, fel na ellir ei ddefnyddio gan unrhyw un yng Nghymru, gan gynnwys ymwelwyr, fel amddiffyniad os cânt eu cyhuddo o ymosod ar blentyn neu ei guro. Ar hyn o bryd, mae'r amddiffyniad yn berthnasol i gyfraith trosedd a chyfraith sifil.
The Bill will remove the common law defence of reasonable punishment so it cannot be used by anyone in Wales, including visitors, as a defence in the event they are accused of assault or battery against a child. The defence currently applies in respect of both criminal and civil law.