Bydd y rheolau hefyd yn cael eu newid i ganiatáu gweithgareddau awyr agored a chwaraeon wedi'u trefnu i blant a phobl ifanc dan 18 oed a hyd at chwech o bobl o ddwy aelwyd wahanol i gyfarfod ac ymarfer corff yn yr awyr agored.
The rules will also be changed to enable organised outdoor activities and sports for children and under-18s to take place and up to six people from two different households to meet and exercise outdoors.