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To evaluate the perinatal outcomes within a pregnant cohort of adolescents aged 16 years and younger.Case review prospective study. All pregnant adolescents who attended to the Coordination for assistance of the adolescent patient from June 1998 to July 2003 were included.age, irrespective from antenatal care inside or outside of the Coordination and delivering inside the institution. Variables analyzed were: age, occupation, marital status, gestational age at first antenatal visit, number of antenatal visits, medical complications during pregnancy, gestational age on delivery, mode of delivery and contraceptive acceptance on discharge. Neonatal variables: weight at birth and intensive care admissions. Statistical analysis included descriptive measures.We identified 2723 pregnant adolescents, from whom only 2,315 met the inclusion criteria. Mean maternal age was 15.3 (SD 0.87). From the total 58% were single and 83.4% were households while only. Mean gestational age on first visit at the coordination was 24.26 (SD 6.79) weeks. The average number of antenatal visits was 4.78 (SD 3.99). The most frequent medical complications affected the genital and urinary tract, with a 54.2% of cervical and vaginal infections, and a 23.8% of urinary tract infections; anemia in 16.7%, threatened preterm delivery in 9.2% and pregnancy induced hypertension in 3.8%. From the total of cases the 79.1% presented with any morbidity. Mean gestational age concluded at 37.58 (SD 3.03), the preterm delivery rate was 15.4%. The most frequent way of delivery was vaginal with a 55.8% rate. On the neonatal outcomes, the mean birth weight was 2819.07 (SD 613.85). The contraceptive acceptance on the discharge was 98%.The adolescent pregnant has a high risk of suffering major complications, such as genital and urinary tract infections, anemia and preterm delivery.