Neonatal mortality rate refers to the number of infants who die within the first 28 days of life per 1,000 live births. This term is often used in the field of public health to track the health of newborns. Some alternative terms for neonatal mortality rate include newborn mortality rate, early infant mortality rate, and perinatal mortality rate. While these terms may have slightly different definitions, they are all used to measure the impact of health interventions aimed at improving infant health and reducing infant mortality. Accurate measurements of neonatal mortality rate help to guide public health policies and resource allocation to improve the overall health of newborns.