This report analyses the relationship between early childhood mortality and maternal and baby characteristics at the time of birth (perinatal conditions) using a linked data set covering all babies born in NSW between 2005 and 2018.

Linkage to NSW and national death registration records identify the children who died by the end of 2019, and their age at death. Connecting the death records to the full birth cohorts allows the risk factors for child mortality to be better identified through multivariate regression analyses that can directly compare the characteristics of babies who have died with the characteristics of babies who have survived to specific ages.