NSW considering baby killer's petition

The NSW government could soon make an announcement on notorious serial baby killer Kathleen Folbigg's petition for a judicial review of her case.

Lawyers for Folbigg lodged the petition in 2015, which reportedly casts doubt on forensic evidence that formed a major part of the case against her.

She is serving a minimum of 25 years behind bars after being found guilty in 2003 of the murder of three of her babies and the manslaughter of a fourth.

NSW Attorney-General Mark Speakman said the petition "raises complex questions to which I am giving appropriate consideration and have taken extensive advice".

"I hope to be in a position to make an announcement in the near future," he said in a statement on Monday.

It comes as the ABC prepares to air phone calls it recorded between Folbigg and a friend, in which she expresses frustration about the state government's delay in considering her lawyers' petition.