ObjectiveTo investigate the effects of gestational weight gain and pre-pregnancy body mass index(BMI) on obstetric outcome, and guide reasonable weight gain during pregnancy.

MethodsThe clinical data of 3 190 term singleton live births pregnant women were retrospectively analyzed.The patients were divided into the low weight group, normal weight group and overweight group based on the pre-pregnancy BMI, and the below standard group, reach standard group and exceed standard group according to the weight increasing during pregnancy.The clinical parameters among different groups were compared to analyze the influence of the pregestational body mass index and pregnancy body gain on obstetric outcome.

ResultsThe pregnant women with standard(BMI) accounted for 68.5%, and the cesarean section rate, forceps midwifery rate, macrosomia birth rate, neonatal asphyxia rate, the first and second stages of labor in overweight group were significantly higher than those in low weight group and normal weight group.The cesarean section rate, forceps midwifery rate, macrosomia birth rate and neonatal asphyxia rate in overstandard group were significantly higher than those in reach standard group and exceed standard group.The incidence rate of low body mass children in low standard group was significantly higher than that in reach standard group and exceed standard group(P < 0.05).

ConclusionsExcessive BMI before pregnancy and excessive pregnancy weight gain can negatively affect on obstetric outcomes.Women of child-bearing age should be guided to maintain normal pre-pregnancy weight and reasonable pregnancy weight gain so as to improve obstetric outcomes.