Prematurity nowadays has taken on significant dimensions. It is a complex medical issue with socio-economic consequences. The estimation of cervical length, assessed during the second trimester of pregnancy, using transvaginal ultrasound, may help to reduce rates of prematurity. By predicting the risk of preterm birth and identifying women who are at high risk of preterm birth, certain practices could be implemented, such as the use of progesterone or cerclage placement. Nonetheless, it remains unsolved the question of certain strategies, such as the use of progesterone in pregnant women with shortened cervical lengths. This work examines the relationship of cervical length during pregnancy to the perinatal outcome.