Gujarat Provincial Municipal Corporations Act, 1949
It shall be the duty of the father and mother of every child born in the City and, in default of the father and mother, of the occupier of the premises in which to his knowledge the child is born, and of each person present at the birth and of the person having charge of the child, to give, to the best of his knowledge and belief, to the Registrar General or, if the City has been divided into divisions, to the Registrar of the division or to a municipal officer appointed under section 365 within seven days after such birth information of the particulars required to be registered concerning such birth: Provided that— (a) in the case of an illegitimate child, no person shall, as father of such child, be required to give information under this Act concerning the birth of such child, and the Registrar General or Registrar, as the case may be, shall not enter in the register the name of any person as father of such child, unless at the joint request of the mother and of the person acknowledging himself to be the father of such child, and such person shall in such case sign the register together with the mother;