RESUMEN
Seven hundred and fifty pregnant women were studied in two groups: group one consisted of 500 pregnant women who were employed in different jobs while group two consisted of 250 pregnant women who were non-working. The study involved clinical and ultrasonic examinations to measure the biparietal diameter and femur length, as well as hormonal assay to the effect of different kinds of work on the outcome of pregnancy. The working pregnant women had higher percentage of premature labour, lower birth weight, an increased incidence of stillbirth and neonatal mortality than the non-working pregnant women. The difference in outcome of pregnancy may be due to an unfavourable circumstances related to work and some nutritional problems rather than to the actual work. Therefore, it is recommended to improve working conditions, facilities, nutrition and regulations related to work