Michael Laws has been asked to take a paternity test to determine whether the son of his ex-girlfriend is his child.
The former shock-jock and politician has not signed the birth certificate after his former girlfriend of four years, Trina McLachlan, gave birth in July.
McLachlan, a one-time political protege of Laws, split with Laws late last year.
A friend of McLachlan's said the Department of Internal Affairs had been in contact with Laws.
The friend said McLachlan, a student and solo mum, was being deprived of access to a Working For Families benefit because the birth certificate was unsigned.