Postpartum obsessive–compulsive disorder (ppOCD) is a prevalent condition that significantly impacts maternal health, infant development, and family dynamics. This chapter discusses the epidemiology, etiology, risk factors, clinical features, and treatment approaches of ppOCD. It emphasizes the interaction of hormonal fluctuations, genetic predisposition, and psychological stressors, as well as the effects of dysfunctional obsessive thoughts on motherhood and infant attachment processes. It is well documented that sleep disorders, particularly postpartum insomnia, may exacerbate the symptoms associated with ppOCD. The treatment modalities, including cognitive behavioral therapy (CBT) and selective serotonin reuptake inhibitors (SSRIs), are examined. A significant emphasis is placed on the role of psychoeducation in reducing stigma and enhancing treatment adherence, recognizing its critical value in promoting optimal outcomes. The chapter concludes with a strong emphasis on the importance of early diagnosis and the implementation of appropriate interventions, underscoring the significance of mitigating the long-term adverse effects on both mother and child.