Abstract To explore the effect of unintended abortion history on premature delivery, infants smaller than gestational age, and low birth weight of primipara when the first delivery. Methods: The clinical data of 4441 primipara from January 2015 to December 2017 were analyzed retrospectively. The effects of unintended abortion history of these women on their premature delivery, infants smaller than gestational age, and low birth weight were analyzed. Results: Abortion history was not an independent risk factor of premature birth (OR 1.51, 95% CI 0.89-2.57, P>0.05, Wald 2.28). Abortion history during the first trimester of pregnancy was an independent risk factor of infant smaller than gestational age (OR 1.61, 95% CI 1.20-2.16, P<0.05, Wald 10.04). Abortion history during the first trimester of pregnancy was an independent risk factor of low birth weight (OR 1.43, 95% CI 1.06-1.93, P<0.05, Wald 5.50). Conclusion: Abortion history of primipara increases the risk of infant smaller than gestational age or low birth weight.
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