Once a petition to terminate parental rights has been filed, the parent is thereafter without authority to execute an act of surrender or otherwise to affect the custody of the child except:
(1) The parent may execute an act of surrender in favor of the department with the approval of the court.
(2) The parent may consent to a judgment terminating his parental rights as provided in Article 1025.2.
Acts 1991, No. 235, §10, eff. Jan. 1, 1992; Acts 2012, No. 730, §1.