Infant Deathrate, or infant mortality rate, refers to the number of deaths among infants under the age of one year per thousand live births. While the term 'infant deathrate' is commonly used, there are many other terms that can be used as synonyms. Some of these include neonatal mortality rate, early childhood mortality rate, child death rate, and under-5 mortality rate. These terms have variations in their definition but generally refer to the death rate in different age groups of children. Understanding the various synonyms for infant deathrate can help in analyzing and comparing the mortality rates of different countries or regions.