**L’Être en gestation** is a bioethical study of the human embryo and the moral questions raised by its status in medicine, science, and society. Vincent Bourguet examines how contemporary biomedical practices have intensified debate over the beginning of human life, the limits of research, and the ethical responsibilities of those who make decisions affecting embryonic development. The book situates these questions within philosophical reflection, considering the relationship between scientific knowledge, human dignity, and moral judgment. Rather than treating bioethics as a purely technical field, it presents the embryo as a central subject of ethical inquiry, asking how society should understand vulnerability before birth and how that understanding should shape medical and legal practice. The work is intended for readers interested in bioethics, moral philosophy, reproductive medicine, and the ethical foundations of modern biomedical research.