The birth weight of an infant is an important issue because it plays an important role in infant and child mortality and also has important implications on health in the overall growth and development of individuals.1 Birth weight has been shown to be an index of intrauterine growth and a reliable predictor of child survival and mental development.23 Numerous studies of research focuses on the factors that determine birth weight.4-10 Factors such as maternal weight gain, smoking, alcohol consumption, gestational age, maternal anthropometry and many other variables have all been the subject of several scientific articles. The World Health Organization defines normal birth weight between 2,500 and 4,000 grams. However, low birth weight (4,000 g)12 has been shown to be significantly less associated with infant mortality in recent years, likely due to medical advances in the management of this condition.13 It has been shown that Smoking reduces birth weight. The mechanism is postulated to be tobacco-induced loss of appetite, leading to reduced maternal nutrition and low birth weight.14 Many other sociobiological factors affecting birth weight include maternal age. , level of education, sex of the baby, prenatal care. , marital status, socioeconomic status, genetic factors and place of residence 2The objectives of this study were to determine the factors that influence birth weight and to establish which of these factors can be used to estimate birth weight . The objectives were to determine the individual effect of each of these factors and their effect as a group. This is an important research question and results from the middle of the article on alcohol and caffeine consumption during pregnancy. Am J Epidemiol 1993; May 1;137(9):941-50.24. Sulaiman ND, Florey CD, Taylor DJ, Ogston SA. Alcohol consumption among Dundee primigravidae and its effects on pregnancy outcome. Br Med J (Clin Res Ed) 1988; May 28;296(6635):1500-3.25. LETAMO G, MAJELANTLE R. FACTORS INFLUENCING LOW BIRTH WEIGHT AND PREMATURITY IN BOTSWANA. J Biosoc Sci 2001;33(03):391-403.26. Reichman NE, Teitler JO. Paternal age as a risk factor for low birth weight. Am J Public Health 2006; May;96(5):862-6.27. Gillman MW, Rifas-Shiman S, Berkey CS, Field AE, Colditz GA. Maternal gestational diabetes, birth weight and adolescent obesity. Pediatrics 2003; March 1; 111(3):e221-226.28. Hypponen E, Smith GD, Power C. Parental diabetes and offspring birth weight: an intergenerational cohort study. BMJ 2003; January 4;326(7379):19-20.