RELATIONS OF PRE-PREGNANT BODY MASS INDEX AND WEIGHT GAIN DURING PREGNANCY WITH PREGNANCY-INDUCED HYPERTENSION AND BIRTH WEIGHT

Objective:To investigate the influence of pre-pregnant body mass index(BMI)and weight gain during pregnancy on pregnancy-induced hypertension and birth weight.Methods:Pre-pregnant body mass index and pregnancy weight gain of 2 412 mothers who had gave full-term birth to a single baby for the first time were measured and the pregnancy outcomes were followed up.Results:The incidence if pregnancy-induced hypertension and fetal macrosomia was significantly higher in the over weight group than in the ideal weight and under weight groups(P0.001);under weight mothers were more likely to give birth to babies with low birth weight than ideal and over weight mothers(P0.001);No matter what the pre-pregnancy body mass index was,the incidence of fetal macrosomia and pregnancy-induced hypertension were high in the mothers of pregnancy weight gain no less than 18 kg(P0.001),whereas low birth weight was significantly more likely occurred in babies whose mother with pregnancy weight gain less than 9 kg(P0.001).Conclusion:Pre-pregnant body mass index and weight gain during pregnancy can be important factors which influence the occurrence of pregnancy-induced hypertension and the birth weight of neonates,so it was very important to advocate regular pre-pregnancy checkups for all pregnancy women and pay more attention to variations of pregnancy weight.