Drawing on sociological and anthropological studies, the aim of this article is to reconstruct how obstetric technologies contribute to a moral conception of pregnancy and motherhood, and to evaluate that conception from a normative point of view. Obstetrics and midwifery, so the assumption, are value-laden, value-producing and value-reproducing practices, values that shape the social perception of what it means to be a “good” pregnant woman and to be a “good” mother. Activities in the medical field of reproduction contribute to “kinning”, (...) that is the making of particular social relationships marked by closeness and special moral obligations. Three technologies, which belong to standard procedures in prenatal care in postmodern societies, are presently investigated: informed consent in prenatal care, obstetric sonogram, and birth plan. Their widespread application issupposed to serve the moral goal of effecting patient autonomy. A reconstruction of the actual moral implications of these technologies, however, reveals that this goal is missed in multiple ways. Informed consent situations are marked by involuntariness and blindness to social dimensions of decision-making; obstetric sonograms construct moral subjectivity and agency in a way that attribute inconsistent and unreasonable moral responsibilities to the pregnant woman; and birth plans obscure the need for a healthcare environment that reflects a shared-decision-making model, rather than a rational-choice-framework. (shrink)