The objective of this study was to describe the epidemiology and the perinatal outcomes of twin pregnancy in the Maternal-Infantile Departament of the National Hospital "Alejandro Posadas". During the period studied there were 2825 births. The prevalence of twin pregnancies was 3.2% (N= 91). From the total of twin pregnancies, 88 were doubles and 3 were triples. It is postulated that the monochorial monovular twins constitutes a different clinical entity, because of a higher proportion of complicatioms, and that the adequate planification of the actions and working connected the perinatal team will improve the care process