(1) Upon the birth of a child whose parents are not married to each other and which requires a guardian, the Youth Welfare Office becomes the guardian if the child has its habitual residence in the territorial extent of this Code; this does not apply if a guardian is appointed even before the birth of the child. If paternity under section 1592 no. 1 or 2 has been cancelled by contestation and if the child needs a guardian, the Youth Welfare Office becomes the guardian at the time at which the decision becomes final and binding.
(2) If the Youth Welfare Office has been the curator of a child whose parents are not married to each other, and if the curatorship ends by operation of law and the child needs a guardian, the Youth Welfare Office that was previously the curator becomes the guardian.
(3) The family court is to issue, without undue delay, to the Youth Welfare Office a certificate on the beginning of the guardianship; section 1791 is not to be applied.