In a population like ours, it is still a problem handling underweight newborns due to its high perinatal mortality and morbidity; which should be prevented with proper prenatal care where risk factors are identified and appropriate action can be taken in a timely manner. This descriptive, retrospective study aims to analyze some maternal factors and pregnancy, to seek his relationship with low birth weight, prematurity or by or intrauterine growth retardation in fetuses at term, compared to the general population. For which 3,616 Perinatal Medical Records stored in the SIP Maternal Perinatal Institute in October 1991 to September 1992. A 8.3% incidence of LBW of which 57.5% were IUGR fetuses and fetuses of 42.5% was found to be reviewed preterm. There was no significant difference in factors like maternal age, education level and marital status; as if there was a difference in the presen...