The evolution of infant mortality.. children who die shortly after birth may not restrict within births or deaths

- Infant mortality rates are high in any society (less than one year) and are therefore constitute a significant part of the total deaths where Akunan broad base of the population pyramid.

- Of the problems of the study of infant mortality that vital their statistics are quite important and is reliable, for example, children who die shortly after birth may not restrict within births or deaths, and there is the problem of the definition of live birth, even among doctors and demographers who mixed them up in determining infant mortality or born dead or abortions.