NMR
Neonatal Mortality Rate

The neonatal mortality rate, as defined by the UN (see SDG), "is the probability that a child born in a specific year or period will die during the first 28 completed days of life if subject to age-specific mortality rates of that period, expressed per 1000 live births."[1]

Also note that "Neonatal deaths (deaths among live births during the first 28 completed days of life) may be subdivided into early neonatal deaths, occurring during the first 7 days of life, and late neonatal deaths, occurring after the 7th day but before the 28th completed day of life."

See also: U5MR, ARR