Few ideas in Igbo thought have been read in as many ways as ogbanje, the child believed to die and return again and again to the same mother. Missionary ethnographers filed it under superstition. Biomedical researchers have traced much of it to sickle cell disease. Pentecostal preachers recast it as demonic bondage, while novelists from Chinua Achebe to Akwaeke Emezi turned it into a figure of divided identity. This article asks what the idea did for Igbo communities in the past and what it still does in a country that carries the largest sickle cell burden in the world. Recent clinical surveys show that the belief still shapes how mothers seek care for sick children. The study combines historical method, documentary and literary analysis, testimony already in the published record, and secondary epidemiological data to follow ogbanje from precolonial cosmology, through the colonial and missionary encounter, to the debates of the present. The study finds that ogbanje belief encoded close observation of family patterns of illness and death; that naming, divination and the search for the buried iyi-uwa worked as social means of managing grief and suspicion; and that every later reinterpretation absorbed the older idea instead of erasing it. Drawing on cultural memory theory and Arthur Kleinman's explanatory model approach, the article argues that ogbanje is better read as a store of communal memory about child loss, and as a framework for endurance, than as an error awaiting correction. It recommends closer working ties between genotype counselling services, churches and custodians of Igbo tradition in southeastern Nigeria.