ABSTRACT
Although the true birth function must be built on the time-space dimension, it is indispensable to add both age and marriage-age dimensions to the birth function. In this chapter, we confine our examinations of the birth function to both dimensions, namely, we observe cohort birth behaviors. I note the magnificent relationship in which the birth behaviors of immediately previous married females govern the birth behaviors of the next married females. The birth function is constructed based on this regularity.
