To explore the pregnancy outcomes, and neonatal status, arising from embryo transfer in unicornual uterine infertility patients.

We analyzed 2499 cycles of clinical data from in vitro fertilization/intracytoplasmic sperm injection-embryo transfer (IVF/ICSI-ET) from 1^st May 2016 to 1^st May 2018 in the Reproductive Center of the Third Affiliated Hospital of Zhengzhou University, including 109 women with unicornuate uterus (the observation group) and 2390 women with normally shaped uterus (the control group).

There were no significant differences in embryo implantation rate, clinical pregnancy rate or miscarriage rate (41.88% VS 42.36%, P = 0.904; 48.62% VS 55.94%, P = 0.133; 11.01% VS 8.99%, P = 0.474) between the two groups. The live birth rate in the observation group was lower than that in the control group (35.78% VS 45.82%, P = 0.040). The fetal birth weight of the observation group was lower than that of the control group among single-born live births (3009.12 ± 430.59 g VS 3413.40 ± 492.25 g, P = 0.017), but the differences were not observed in the sex ratio at birth, premature birth rate, low birth weight infant (LBW) rate and macrosomia rate (P > 0.05). The fetal birth weight of the observation group was lower than that of the control group among twins live births (2480.00±190.32 g VS 2606.02±471.59 g), but the difference between the groups did not reach statistical significance (P > 0.05)．Logistic regression analysis showed that age, number of embryos transplanted and uterine morphology were independent influencing factors of live birth.

Compared with women with normal uterus, the live birth rate of women with unicornuate uterus is low, and the birth weight of newborns with single birth is reduced.