The mother of a newborn who’s body was found dumped in the backyard of a Stockton home on Tuesday has been located at Penrith in Sydney’s west.

Police say they have spoken to 18-year-old woman about the birth of her child and have ruled out the involvement of any third party.

Detectives are still awaiting the results of a post-mortem examination and forensic testing before deciding on the next step in their investigation.

They say due to the volume of forensic evidence involved, their inquiries are expected to be prolonged.

Police have thanked the community for their assistance.

Detectives are continuing inquiries on behalf of the Coroner