Article 260

If after a judgment annulling a marriage, the former wife should believe herself to be pregnant by the former husband, she shall, within thirty days from the time she became aware of her pregnancy, notify the former husband or his heirs of that fact. He or his heirs may ask the court to take measures to prevent a simulation of birth.

The same obligation shall devolve upon a widow who believes herself to have been left pregnant by the deceased husband, or upon the wife who believes herself to be pregnant by her husband from whom she has been legally separated. (n)