The objective was to evaluate the body-mass index (BMI), maternal weight gain and the percentage of maternal weight in relation to reference table of weight for height in women with good pregnancy outcome. A total of 250 pregnant women were prospect followed up from week 20 to the end of the pregnancy. Maternal height, (BMI), maternal weight gain at 20 weeks' gestation, the last nearest to delivery, and percentage of maternal weight were recorded. A (BMI) between 19 and 27 was seen in 80% of the women, partial body weight with a range of 4 to 6 kg, total body weight from 7 to 18 Kg, and the range of values of percentage of weight that we obtained was between 89 and 125%. References of weight gain and prepregnancy BMI for a specified population would allow a nutritional assessment of the pregnant women.