In order to assess characteristics of women with denial or concealment of pregnancy until delivery, the authors conducted a retrospective study of women with no history of prenatal care who presented to their institution for delivery or immediately postpartum. Among these women, 29% had denied pregnancy, and 9% had concealed pregnancy. Authors constructed models predicting denial or concealment of pregnancy and further elucidated subtypes of denial and concealment of pregnancy. Strikingly, psychiatric consultation was rare for women who had denied or concealed their pregnancies, and yet they would often subsequently take responsibility for their infants.