OBJECTIVE: To investigate the effects of pre-delivery hematological parameters on birth weight and tocompare their relationship with maternal age and parity in women who had taken routine iron supplementationduring pregnancySTUDY DESIGN: A retrospective study was conducted among low-risk pregnant women who were deliveredat term. Pre-delivery hematological parameters and clinical information were extracted from patientfiles and compared with birth weights. Women with known hematological disorders, women with theprevious history of intravenous iron treatment and the ones who did not regularly use iron supplementationwere excluded.RESULTS: All patients (1066) had undergone complete blood testing before delivery. Mean values forhemoglobin, hematocrit, mean corpuscular volume, red blood cell count and red cell distribution widthwere as follows; 10.9g/dL (±1.4), 34.6 % (±4.3), 84.6fL (±7.8), 4.1g/dL (±0.4), and 14.2 % (±2.5), respectively.When all patients are evaluated, 300 (28%) of them were found to be anemic according toWord Health Organization criteria but not for the former ACOG cut-off, which was 9.5 g/dL. There wasno significant association between pre-delivery anemia and birth weight. However, the anemic womengroup was found to be slightly younger than non-anemic ones according to both criteria.CONCLUSION: Our results documented that younger age was associated with more pronounced anemiabefore delivery. This study did not show any association between pre-delivery anemia and low birthweight irrespective of maternal age. There is a need for further reports investigating the prognostic importanceof hemoglobin reduction during pregnancy for infant birth weight in specific age groups and placentalinsufficiency related conditions.