In any case in which the deceased whose death is being investigated is a child whose death is determined to have been the result of sudden unexplained infant death, the supervising medical examiner shall file a record of the case with the bureau of maternal and child health, department of health and human services. The bureau shall not release this report to any person without the written permission of the supervising medical examiner. The bureau may inform the parents of the child of the disposition of the case in a letter, but shall not include any portion of the autopsy report.