Abstract
After 1989 the process of fertility in Czechia and Slovakia has undergone historic and unique transformation. One of the main sign of these changes is the ageing of the fertility age-profile mainly caused by the postponement of births into higher ages of reproductive age span.
The main objective of this paper is to analyse the spatial differences in the character and intensity of fertility in the early 1990s and current era and effort to highlight any stability and possibly changes in the spatial patterns that have occurred as a result of the transformation of reproductive behaviour. The results showed that there are some areas of similar character and course of the fertility postponement transition.
The main differentiating spatial factor affecting fertility in both countries are particularly the timing and internal structure of fertility by woman's age.