The medical treatment in utero of human beings raises several ethical questions. I argue that treatment is sufficient to establish the fetus as person; and consider how conflicts between the interests of the fetus and mother are to be resolved when such treatment is proposed. My arguments rest upon a ‘relational model’ of ethical discourse derived from H. Richard Niebuhr's “ethics of the fitting.”I conclude that the limitation of personal autonomy is rarely justified, but may be when direct, grave, harm (...) to others is imminent; and that educative rather than punitive measures are the best prospect for protecting fetal life. (shrink)