§ 7. Mentally defective or mentally disordered children.

Whenever it shall be determined by the judge of the juvenile court that a child is so mentally defective or mentally disordered that such child should be committed to an institution for such cases, the court may commit such child to such institution as is fitted to care for such cases wherein the court is authorized to so do by provisions of the general laws, or to such institution otherwise made available to the court through arrangements with the county or state authorities; and where no such institution is made available to the court, the judge shall certify the facts and the needs of the child to a court of competent jurisdiction, and said judge shall take such action as appears in his opinion is for the best interest of said child.