Women with a child affected by neonatal lupus may enroll in the Registry. Women can be self referred or referred by their doctors. Siblings of women with a child affected by neonatal lupus, fathers and maternal grandparents of children with neonatal lupus, and unaffected siblings of a child with neonatal lupus are also invited to participate in this study. All information on the mother and her family is confidential; only nonidentifying information will be provided to researchers. Women interested in the registry will be sent articles and educational materials about neonatal lupus, a consent form for the Registry, and an enrollment questionnaire. Participants will be asked to sign a medical records release form. Participants will also be asked to donate a blood sample for antibody testing and DNA isolation.