RESUMO
Birth weight is considered as the most important indicator of growth and intrauterine development as well as the nutritional status of the newborn. Several reports have demonstrated the influence of both biological and social variables on low birth weight, among which being discussed is the influence of the mothers work activities. Two hundred and thirty-two newborns were studied at the Regional Hospital "20 de Noviembre" of the Institute de Seguridad y Servicios Sociales para los Trabajadores del Estado (ISSSTE) and selected based on inclusion and exclusion criteria which homogenized the sample and allowed to associate the work status of the mother with the low birth weight of the child. The somatometric data of the newborns was obtained from official registrars from the Perinatology Ward and directly from the mothers who were interviewed. The results did not significant statistical differences in the weight of the newborns of those mothers who do work than in those who don't. It was concluded that for this sample, the favorable socioeconomic fund established by a double family income apparently compensates any disadvantages which the work activity could have on the newborns' weight.
