Regarding pregnancy complications among teenagers, we evaluated their effects on other adverse obstetric outcomes. Anaemia was a risk factor for very preterm birth (adjusted OR 2.1, 1.1 to 4.2). Proteinuria was found to be a risk factor for pre-eclampsia (5.4, 3.6 to 8.0), but not for eclampsia or adverse neonatal outcomes. UTI and pyelonephritis did not affect the risks of adverse obstetric outcomes.