A newborn baby found abandoned by dog walkers was not a stillborn and lived for a short period of time before dying, police have said.
The baby, named Alia by detectives was found shortly before 4.55pm on March 14 in Lostock, near Bolton.
Police on Tuesday released images of items which were recovered along with her body in the hope of tracing her parents.
She had been wrapped in clothing and plastic bags and a message requested that she receive an Islamic burial.
Following discussions with the Bolton Council of Mosques (BCOM), detectives named her Alia, meaning beautiful.
A specialist neonatologist has established that she was born alive and lived independently of her mother for up to two hours; however the cause of her death remains unascertained, as does her ethnicity.
Three items recovered along with her body included a Tesco bag, which had written on it in English: "Please please bury Islamic way please please."
It is believed baby Alia was wrapped in a white shirt and cotton trousers and placed in this bag.
The Tesco bag was then placed in a JD bag and a pair of three- quarter length, paint-stained cotton trousers were also found at the scene.
Detective Inspector Aaron Duggan, from Greater Manchester Police (GMP), said: "Despite the passage of time, our primary concern still remains the welfare of baby Alia's parents, in particular her mother.
"She was found almost six weeks ago and we still need to make sure both mum and dad are OK, both physically and mentally. This will have been a traumatic experience for them, particularly if they are young.
"We have made good progress with the investigation and now know that she was born alive and lived independently from her mother for a short period.
"What we don't know, and what we are trying to establish, is how, where and when she died and when she was placed at Ox Hey Lane and by whom.
"I want people to think about someone that perhaps they knew or suspected was, up until recently, pregnant and, coupled with these images, now think they know who the mother or father is and to call us in confidence.
"I want to appeal to the parents directly to come forward, to talk to us and explain what happened to their daughter. I want to reassure them that specialist help is still available if required."
Anyone with information is asked to call police on 0161 856 5448, or Crimestoppers, anonymously, on 0800 555 111.