(87) Guardians ad litem to defend a suit may be appointed by the court, or by any judge thereof, for infants or other persons who are under guardianship, or otherwise incapable to sue for themselves. All infants and other persons so incapable may sue by their guardians, if any, or by their prochein ami, subject, however, to such orders as the court may direct for the protection of infants and other persons.