Background <p>Modern obstetric practices have dramatically reduced maternal and neonatal mortality through medical innovation. Despite these achievements, essential preventive structures are increasingly questioned, while major obstetric complications still occur—predominantly in women without known risk factors.</p> Objective <p>This review aims to demonstrate why preventive medicine and structured clinical systems are fundamental prerequisites for safe childbirth and to analyze two key domains of modern obstetrics: postpartum hemorrhage (PPH) and extended first-trimester screening (ETS).</p> Materials and methods <p>The work comprises a narrative, evidence-based review of international studies, guidelines, and mortality audits related to PPH, placental dysfunction, and predictive first-trimester risk models.</p> Results <p>Severe PPH events are largely attributable to preventable systemic failures—particularly unreliable visual blood loss estimation, lack of standardization, and insufficient resources. Objective quantification methods and algorithm-based emergency pathways significantly reduce morbidity. ETS enables highly accurate prediction of preeclampsia, fetal growth restriction, preterm birth, early metabolic dysregulation, and rare but critical conditions such as vasa previa and placenta accreta spectrum. Early prophylactic interventions, especially aspirin, markedly decrease severe outcomes.</p> Conclusion <p>Only when risks are identified early and addressed systematically can modern obstetrics be safe. Prevention is not optional but rather a&#xa0;structural and ethical imperative. Both PPH management and ETS illustrate that safety arises not from limiting medical intervention but from evidence-based diagnostics and well-defined clinical processes.</p>