A Retrospective Cohort Study On The Relationship Between Pre-pregnancy Body Mass Index And Weight Gain During Pregnancy And Newborn Birth Weight

Objective:To explore the effects of pre pregnancy body mass index and weight gain during pregnancy on neonatal birth weight outcome.Methods: From January 1,2016 to January 1,2019,14543 parturients who delivered singletons in the Peace Branch of Northern Theater General Hospital were collected.According to pre-pregnancy body mass index(BMI),weight gain recommended by pregnancy guidelines and newborn babies were divided into groups according to birth weight.Logistic regression model was used to analyze the effects of pre-pregnancy body mass index and weight gain during pregnancy on newborn birth weight.Results:1.The basic information of each group,including the age of pregnant women,the height of pregnant women,the body mass index BMI before pregnancy,the weight gain during pregnancy,the birth weight of newborns and the number of pregnant women,were compared.Among the pre pregnancy BMI groups,the average weight gain during pregnancy decreased with the increase of pre pregnancy body mass index.With the increase of pre pregnancy body mass index,the average birth weight of newborns also increased.Although the average weight gain during pregnancy was the highest in low weight pregnant women,the average birth weight of newborns in this group was the lowest.2.The relationship between pre pregnancy system index,the range of weight gain during pregnancy and different neonatal outcomes.Low weight pregnant women before pregnancy are more likely to reduce the risk of macrosomia,and pregnant women with excessive weight gain during pregnancy are more likely to reduce the risk of macrosomia.Overweight pregnant women before pregnancy are the population with the lowest risk of premature birth.Pregnant women with insufficient weight gain during pregnancy and excessive weight gain during pregnancy are at high risk of premature birth.Obese pregnant women before pregnancy are less likely to reduce the birth risk of infants older than gestational age.Pregnant women who gain too much weight during pregnancy are more likely to reduce the birth risk of infants older than gestational age.Pregnant women with insufficient weight gain during pregnancy and excessive weight gain during pregnancy are high-risk groups for the birth risk of small for gestational age infants.3.The relationship between weight gain during pregnancy and different neonatal outcomes among different pre pregnancy body mass index groups.Obese pregnant women with insufficient weight gain during pregnancy can reduce the birth risk of macrosomia by 63%.The birth risk of preterm infants in low weight pregnant women with insufficient weight gain during pregnancy is 2.77 times higher than that in normal weight pregnant women.The risk of premature birth of overweight pregnant women with insufficient weight gain during pregnancy is 4.03 times higher than that of normal weight pregnant women with insufficient weight gain during pregnancy.For overweight pregnant women with appropriate weight gain during pregnancy,the birth risk of small for gestational age is 2.62 times higher than that of normal weight pregnant women.Overweight pregnant women who gain too much weight during pregnancy can reduce the birth risk of infants older than gestational age by 53%.4.The abnormal weight gain during pregnancy of pregnant women with normal BMI before pregnancy was compared with that of other BMI groups.The results showed that there was a correlation between low weight pregnant women before pregnancy and insufficient weight gain during pregnancy.Low weight pregnant women before pregnancy were the high-risk group of insufficient weight gain during pregnancy.There is a correlation between pregnant women with Abnormal BMI before pregnancy and excessive weight gain during pregnancy.Obese pregnant women before pregnancy are high-risk groups for excessive weight gain before pregnancy.Low weight pregnant women before pregnancy can reduce the risk of excessive weight gain during pregnancy by 70%.Conclusion:1.Different body mass index before pregnancy and abnormal weight gain during pregnancy have statistical significance for the outcome of neonatal birth weight.Abnormal weight gain during pregnancy is a high-risk group for premature infants and small for gestational age infants.2.The risk of premature birth in low weight pregnant women with insufficient weight gain during pregnancy is 2.77 times higher than that in normal weight pregnant women.The risk of premature birth of overweight pregnant women with insufficient weight gain during pregnancy is 4.03 times higher than that of normal weight pregnant women.For overweight pregnant women with appropriate weight gain during pregnancy,the birth risk of small for gestational age is 2.62 times higher than that of normal weight pregnant women.3.Low weight pregnant women before pregnancy are more likely to lead to insufficient weight gain during pregnancy,and obese pregnant women before pregnancy are more likely to lead to excessive weight gain during pregnancy.