Police are searching for a mother and father who are missing with their newborn baby after their vehicle broke down near a motorway.
Greater Manchester Police (GMP) has said evidence suggests Constance Marten had "very recently given birth, and neither her or the baby have been assessed by medical professionals".
Officers have appealed to Ms Martin, saying their "number one priority" is to keep her "beautiful newborn safe".
Ms Marten and the baby's father Mark Gordon were with their child when their vehicle broke down near junction four of the M61, near Bolton, on Thursday night.
The family then walked towards Anchor Lane bridge which links the Highfield and Little Hulton areas.
Mr Gordon is described as wearing dark clothing while Ms Marten, who has a southern accent, was wearing a burgundy coat. The baby was swaddled.
GMP's head of public protection, Chief Superintendent Michaela Kerr, said: "As a mum, I would like to make a direct appeal to Constance.
"Constance, I know this is an exceptionally hard time for you and you are likely feeling scared, but I promise that our number one priority is the same as yours - to keep your beautiful newborn safe.
"As you know, it's really important that both you and your baby are assessed by medical professionals as soon as possible, so please make contact with emergency services or make your way to your nearest hospital, wherever that may be.
"I would also like to appeal to members of the public - not just in Bolton but across Greater Manchester and beyond.
"If you have any information about this family's whereabouts, please do nothing more than contact emergency services."