Objective: Due to the increase in fertility rate in teenagers, the interest in knowing the possible complications in the newborns also has increased. Several studies discovered that pregnancy in extreme ages is considered a risk factor for complications in newborns. Other studies have not identified a correlation between teenage pregnancy and complications in newborns. The purpose of this study is to analyze the association of complications in newborns of early teenage mothers (10 to 14 years old) compared to the newborns of adult mothers (20 to 35 years old). Material and Methods: Analytic, retrospective cohort study. The population is the total amount of newborns of early teens plus the same amount of mothers between the ages of 20 and 35 years. Results: From the total of newborns (16 601), 0.37% were part of the early teenagers group. 87.1% of the early teens and 72.6% of the adults m...