mothers pre-pregnancy body mass index, weight alterations and neonatal birth weight

Background: in order to clarify the association between maternal body mass index and gestational weight gain with maternal and fetal complications. methods: in this descriptive cross-sectional investigation, pregnant women with 18-30 years of age referring to health care centers in sari, mazandaran, iran were enrolled results: in this study 400 pregnant women were examined. the mean ± sd age of study population was 27.8 ± 4.8 years. 125 participants (31.3%) were presented with low iom and 77 patients (19.3 %) were high iom. the mean weight of fetal birth weight was 3.2±0.4 kg. weights of 377 newborns were between 2500 to 4000 gr. 8 cases (2%) had low birth weight and 15 cases (3.8%) were over than 4000 gr. the mean ± sd of newborns length was 49.6 ±5.6 cm. the mean ± sd of head circumflex of newborns was 34.4± 3.6 cm. there was no significant association between mothers bmi and infant head circumflex, height and weight. there was no significant correlation between macrosomia and mothers iom (p=0.07). there was no significant association between infants’ weight and mothers iom (p=0.3). there was significant correlation between bmi and iom (p=0.000). preterm delivery was noted in 6 women (6.5%) with bmi more than 29 and in 1 participant (1.2%) with bmi of 26.1 to 29. there was significant association between bmi and preterm birth (p=0.001). gestational diabetes mellitus was noted in 6 women with bmi more than 29 (p=0.000). gestational diabetes mellitus was reported in 6 women with normal iom (p=0.04). preeclampsia was noted in 3 women with bmi of 26.1 to 29 (p=0.04). conclusion: pregravid overweight or gaining weight will increase the risk of overweight birth.