Background: The birth regulation experience of Southeast Asian women in transnational marriages in Taiwan has a special historical background and significance. However, previous research on this population has em-phasized their cultural, social, and family education needs, with less attention directed toward their birth regulation concerns. Purpose: The aim of this qualitative study was to explore the life experience of birth regulation among Southeast Asian women in transnational marriages in Taiwan. Methods: Phenomenology methodology explored the experiences of 11 participants. Purposive sampling recruited participants from among outpatients registered in the postpartum ward of a local hospital in northern Taiwan. Each semi-structured, in-depth interview was taped, transcribed and analyzed using Colaizzi’s framework. Results: Phenomenological description yielded three essential themes: (1) reappearance of the patriarch: carrying on the family name as the marriage mission and investing hope in the child; (2) helplessness in the face of reduced sexual and reproduction rights: birth control autonomy controlled by husband and sexual life controlled by hegemonic thinking; (3) confusion and adjustment to medical and nursing culture shock: limited knowledge and doubt regarding birth regulations and adjustment to the unfamiliar medical environment. Conclusions / Implications for Practice: This woman-centered view of the life experience of birth regulation among Southeast Asian women in transnational marriages in Taiwan may assist healthcare professionals to better understand the educational needs of this population. Policymakers may reference these results to develop an appropriate family-planning educational program for the Southeast Asian women of reproductive age in transnational marriages in Taiwan.