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Data a dadansoddiadau o Gyfrifiad 2021
Cyswllt: cim@ons.gov.uk
Last revised: 6 August 2014
( )
Amlder: Annual
Sut gafodd ei grynhoi: Sample based survey
Cwmpas daearyddol: England and Wales
The Unexplained deaths in infancy: England and Wales was superseded in August 2017.