Fel y nodwyd mewn datganiadau blaenorol, mae Prif Swyddog Meddygol Cymru yn adolygu ei gyngor i'r rhai sy'n gwarchod eu hunain yn ôl  yr un cylch 21 diwrnod â'r adolygiad o'r rheoliadau ar gyfyngiadau symud. Ers yr adolygiad diwethaf mae wedi addasu ei gyngor i alluogi'r rhai sy'n gwarchod eu hunain i fod yn rhan o aelwyd estynedig. Gwnaed y penderfyniad hwn oherwydd yr effeithiau y gall unigrwydd a bod yn ynysig eu cael ar iechyd meddwl unigolyn a hefyd i annog y rhai sydd wedi bod yn aros gartref am gyfnod estynedig i ddod allan i amgylchedd lle maent wedi gallu trafod a chytuno ymlaen llaw sut y gallant deimlo'n ddiogel.
As advised in previous statements, the Chief Medical Officer for Wales reviews his advice for those who are shielding on the same 21-day cycle as the review of the lockdown regulations. Since the last review he has modified his advice to allow those who are shielding to be part of an extended household. This decision was taken because of the impacts that loneliness and isolation can have on an individual’s mental health and also to encourage those who have been staying at home for an extended period to come out into an environment where they have been able to discuss and agree in advance how they can be and feel safe.