Since the beginning of the 1990's there have been relatively large changes in the reproductive behaviour of the population of the Czech Republic, including a significant increase in the proportion of children born out of wedlock. The paper describes the development of fertility rates among unmarried and married women in the years 1989–2014 in detail. Attention is paid to three main influences which are responsible for the proportion of children born out of wedlock, and obviously above all to the rates of nonmarital and marital fertility (by age and by birth order). The analysis shows that although there has been a convergence of the rates of fertility of married and unmarried women since the beginning of the 21st century, the reproductive behaviour of these women is still significantly different (average age of mother at birth of (first) child, distribution of birth order).
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