| Sumario: | A study was conducted to explore several socioeconomic and biological characteristics that may impact the relatives risks and the timing of early births in Iran. Data are drawn from the Kohgylooye and Bovairahmad province, Iran, to discuss problems of model specification in birth interval analysis; to examine the timing of first, second, and third birth intervals; and to test the hypothesis that all important variations in fertility are captured by differences in marriage, breastfeeding, contraception, and induced abortion. Findings indicated the importance of accounting for the contraceptive use practices and other biological and behavioral variables in the study of birth interval. Findings suggested that socioeconomic variables do have something to add to the explanatory power of a model over and above the contribution made by the proximate determinants. Findings are discussed in detail.
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