The perfect mother is a ubiquitous, if impossible, part of American life. We see her in spandex at the gym, working out—self-care!—a week after delivering twins. She’s at center-stage when internet experts opine about how mothers can prevent teenagers’ opioid addictions. In the shadow of this unattainable, idealized vision of a mother as a virtual guarantor of their children’s health and happiness, actual mothers berate themselves for falling short of perfection, feeling ashamed and inadequate. In the American legal system, the pervasive stereotype of the perfect mother can lead to serious consequences, dramatically distorting the judgments of police, prosecutors, judges, and jurors.