Adolescent pregnancy is common health problem still found in both developed and developing countries; as adolescent may have early sexual practice or early marriage. Adolescent mothers face substantially higher maternal and perinatal morbidity and mortality than adult women. This is a randomized prospective clinical study conducted at Al-Elwiya Maternity Teaching Hospital, Baghdad, Iraq. The objective of this work is to assess the adverse maternal, fetal and neonatal outcomes in early and late teenage pregnant mothers. Study sample consisted of 220 primigravid women with a singleton, cephalic, viable fetus and no congenital abnormality that gave birth at Al-Elwiya Maternity Teaching Hospital, Baghdad, Iraq. The 1stgroup: early teenage (46 women between 11-14 years), the 2nd group: late teenage (74 women between 15-19 years) and the 3rdgroup: control group (100 women between 20-29 years). Pregnancy outcomes were observed for mothers: mode and duration of labor, post-partum hemorrhage and endometritis and for neonates: gestational age, birth weight, Apgar score, admission to neonatal care unit and neonatal outcome. Anemia was the only significant medical complication associated with pregnancy that was observed in both teenage groups (P-value= 0.0001). Prolonged labor, postpartum hemorrhage and blood transfusion all were significantly higher in teenage groups (P-value= 0.019, 0.0001 and 0.0001 successively). Adolescents showed lower birth weights as compared to adults (mean birth weight was 2.8 kg, 2.98 kg in both teenage groups and 3.98 kg in the control group), Lower Apgar scores at 1 minute and …