Patterns of reproduction associated with extramarital conception are e
xamined using data on non-marital births, marital births occurring dur
ing less than 8 months after marriage, and spontaneous and induced abo
rtions experienced by unmarried women. Trends in the incidence and dem
ographic outcomes of conceptions resulting from extramarital coitus ar
e analysed by means of age-specific probabilities of becoming pregnant
outside marriage; and of terminating such a pregnancy by abortion, by
legitimating it through marriage before confinement, or by having a b
aby while remaining unmarried. Substantial increases in the proportion
of extramaritally conceived pregnancies leading to non-marital births
are detected for the period since the late 1980s, and ascribed mainly
to rising levels of unmarried cohabitation. The demographic effects o
f the post-1989 transition from state to market economy are discussed.