Background & Objectives: 11% of all newborns in the developing countries suffer from low birth weight (LBW). Birth weight has an important role in individual health, family and society. Lower and higher birth weight from standard rate lead to morbidity and mortality. The purpose of this study was to determine associations between some of maternal anthropometric measurements such as BMI, pre-gravida weight, height, age with birth weight.

 Methods: This is an analytical-descriptive study, in which there were 300 pregnant women who hard referred to Alavi Hospital, Ardebil for delivery. Maternal pre-gravida height, weight and birth weight were collected from their units. Body mass index (BMI) was calculated by dividing the maternal pre-gravida weight in kg by height in m squared (kg/m²). The relationship between maternal anthropometric measurements and birth weight was analyzed by t-test.

 Results: Our study showed that 32 (10.7%) women had BMI<19.8, 185 (61.7%) BMI=19.8-26 and 83 (27.7%) BMI>26. 36.3% of women were under 55 kg, 48.3% between 55 to 70 kg and 15.3% over 70 kg. The relationship between maternal pre-gravida BMI, weight and birth weight was statistically significant (p=0.001). There was no significant difference between maternal age and neonatal birth weight.

 Conclusion: Pre-gravida body mass index (BMI) and weight could be two important anthropometric measurements associated with birth weight. Thus, it is recommended that women give adequate preconceptional and prenatal care to decrease the amount of LBW and HBW in population.