New South Wales Police are urging the mother of a baby abandoned in the backyard of a Western Sydney home to come forward for help.
A family living in a home on Girra Road in Blacktown found the baby girl on one of their outdoor chairs on Friday.
The family had gone indoors after finishing lunch when they heard crying in the backyard.
Police said she was between one- and three-hours old.
She was not clothed and still had an umbilical cord attached to her.
They believe the baby girl was left there sometime between 12:30pm and 2:40pm.
The family, who cleaned her up and called for help, had moved into the newly-built rental house about a week ago.
Despite extensive investigations, police still have not been able to track down the mother and have concerns for her welfare.
""We're really concerned about her and her welfare, her physical and mental wellbeing," Acting Inspector David McInerney said.
"For anyone to leave a child like that, they obviously need some sort of help," he said.
"We are trying to help her … I want to stress she's not in any trouble from police."
He encouraged her to contact police, attend a hospital or ring an ambulance.
Inspector McInerney said the baby was not born at a hospital.
"They [police] are canvassing nearby areas for any signs of childbirth," he said.
Detectives have spent the day doorknocking neighbours and have acquired CCTV and dashcam footage.
Police want anyone who saw someone pregnant in the area or appeared distressed to come forward.
The now one-day-old girl was in good health when she was found and she is being cared for at Blacktown Hospital.
The Department of Communities and Justice (DCJ) has assumed her care.
"DCJ is working with NSW Health to support the care and wellbeing of the baby and the mother when she comes forward," a spokesperson said.
"We urge her to make contact with a hospital or police."
'Don't know why they picked that house'
Stewart Reid, who lives on Girra Road, said police knocked on his door on Friday to ask if he had any CCTV or had seen anything unusual.
He said the house where the baby was left had only just been built and the residents moved in a few weeks ago.
"I don't know why they picked that house out of all the houses," he said.
"It's just something I can't fathom doing.
"I feel sorry for the baby ... I hope they find the mother and I hope she is ok."
Officers also spoke to Gorge Koong and requested to take his hard drive.
The local of more than 30 years was doing gardening in his backyard when approached by police.
"I was pretty surprised when the police came and knocked on the door and said, 'Do you have the camera on?'," he said.
"They [police] wanted to know if they can catch any lady walking past my property. I said I didn't see anything.
"So they asked me for the hard drive so they can look back and see if there's any picture or anything like that."
Teresita Devilla also lives on Girra Road and said she was in disbelief when she heard the news.
"Maybe she was a single mother, maybe she couldn't afford it.
"I'm a mum so I'm very shocked."