Yn dilyn adolygiad ffurfiol o gyfyngiadau symud lefel rhybudd pedwar, a gyflwynwyd am hanner nos ar 19 Rhagfyr, bydd yr holl fesurau'n parhau yn eu lle.
Following a formal review of the alert level four lockdown restrictions, which were introduced at midnight on 19 December, all the measures will remain in place.