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Objectives:To investigate the magnitude of effect nurse staffing had on decreasing the newb mortality rates in member countries of Organisation for Economic Co-operation and Development (OECD).Methods:The statistical technique of panel data analysis was applied to explore the possibility of association between the number of nurses’ density per 1,000 population and infant,neonatal and perinatal mortality rates (IMR,NMR and PMR) per 1000 births.The observations of 35 OECD countries were collected over the period of 2000 through 2016.Results:There were significant associations between nurse staffing and IMR,NMR and PMR i.e.a 1％ increase in nurse-staffing level reduced IMR,NMR and PMR by 0.98％,0.97％ and 0.96％,respectively.Furthermore,the role of nursing-related services in declining the average of newb mortality rates were investigated at the highest level in Slovenia (-5.50),Sweden (-3.34),Iceland (-2.51),Czech Republic (-1.86),Japan (-1.64) and Finland (-1.64).Moreover,if the current relationship between nursestaffing level and newb mortality rates are disturbed with nursing shortage (e.g.in Slovak Republic and Israel),then it takes about 17 years for the mortality rates to reduce and restore back to the previous equilibrium.Conclusions:A higher proportion of nurses’ density per 1,000 population is associated with lower newb mortality rates.In addition,the nursing-related services of Slovenia,Sweden,Iceland,Czech Republic,Japan and Finland with the highest impact on improving the health level of newbs would be good patts for other developed countries in matity and child health care.