Abstract Objective: To investigate the effect of body mass index (BMI) increment of pregnant women during pregnancy on their maternal and infant outcomes. Methods: The clinical data of 347 pregnant women from January 2018 to March 2019 were analyzed retrospectively. The included women were divided into group A (BMI increment during pregnancy <5kg/m2), group B (BMI increment during pregnancy ≤10kg/m2), and group C (BMI increment during pregnancy >10kg/m2). The maternal and infant outcomes were compared among the three groups. Results: The total labor duration and the speed of uterine cervical duct dilation of women in group C were 12.19±1.99 h and 0.80±0.17 cm/h, which were significant higher than those of group A and group B (P<0.05). The proportions of cesarean section and forceps delivery of women in group C were 47.8% and 20.9%, which were significantly higher than that in group A (P<0.05), but which of women in group C had no significant differ from those of women in group B (P>0.05). The proportions of macrosomia and neonatal asphyxia of women in group C were 20.9% and 11.94, which were significant higher than those of women in group A (P<0.05), but which had no significant differ from that of women in group B (P>0.05). The proportions of gestational diabetes mellitus, gestational hypertension, and postpartum hemorrhage of women in group C were 17.9%, 19.4%, and 17.9%, which were significant higher than those of women in group A (P<0.05), but which had no significant differ from those of women in group B (P>0.05). Conclusion: When BMI increment of pregnant women during pregnancy≥ 5 kg/m2, they should be given intervention measures actively.
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