Objectives: Identify obstetric and perinatal complications in pregnant adolescents and the gestational age of presentation. Material and methods: Transversal descriptive study in pregnant adolescents, all those who over the years 2015-2017 presented pregnancy were studied. We studied prevalence and gestational age of presentation of obstetrics complications as abortion, urinary tract infection, cervicovaginal infection, preeclampsia/eclampsia, premature rupture of membranes, preterm labor; also we evaluated the condition of the product to the birth as weight, apgarpunctuation, prematurity, hyaline membrane and jaundice. The statistical analysis included confidence interval. Results: The urinary tract infections prevalence is 40.5% (CI 95%; 30.9-50.1), at 20.42 weeks (CI 95%; 17.69-23.15), abortion prevalence is 22.7% (IC 95%; 14.4-31.0) at 9.69 weeks (CI 95%; 8.48-10.9), and premature rupture of membranes is 7.0% (IC 95%; 1.9-12.0) at 35.29 weeks (CI 95%; 30.86-39.71). Conclusions: The obstetric complications prevalence and gestational age of presentation in pregnant adolescents was identified.