Police in Derbyshire are continuing to question a 28-year-old woman arrested on suspicion of wilful neglect.
It is in connection with the birth of a baby boy in an area around Sports Direct Warehouse in Shirebrook in Derbyshire.
The baby is being treated at a neo-natal unit and making good progress, according to Derbyshire Constabulary.
Derbyshire police have arrested a woman in connection with the birth of a baby at business premises in Shirebrook.
The 28-year-old woman was arrested yesterday on suspicion of wilful neglect.
Officers were called out on New Year's Day following the birth of a baby in "unusual circumstances". The baby boy is being treated at a neo-natal unit and is making good progress but is still under going tests.
Police have launched an inquiry after a baby was born at a warehouse on New Year's Day and then admitted to a neo-natal unit.
Derbyshire Police said the baby's mother, who is believed to be of eastern European origin, was also taken to hospital for treatment.
Officers were unable to confirm reports that the child was born in a toilet block at a Sports Direct warehouse in Shirebook, near Bolsover, Derbyshire.
The infant, whose mother is aged in her 20s, is described as being in a serious but stable condition.
In a statement, Derbyshire Constabulary said: "Police were called by the ambulance service at around 11.15pm on January 1 to reports of the birth of a baby in unusual circumstances at a business premises in Shirebrook.
"The baby was taken to a neo-natal unit, where he remains. Officers are still investigating the circumstances surrounding the birth."
A house fire which killed two women and two young brothers is believed to have been started after an electrical fault, a fire service investigation found.
Jordan Green, 12, and his nine-year-old brother Tyler died with their mother Josie Leighton, 32, and her friend Claire James, 27, in the blaze in North Wingfield, near Chesterfield, on November 20.
In a statement, Derbyshire Fire and Rescue Service said: "Thorough investigations point to an accidental fire caused by a fault in electrical wiring between the ground and first floor of the property.
"Derbyshire Fire and Rescue Service would once again like to convey its thoughts and sympathy to the families of the deceased at this very distressing time."
A Derbyshire police spokesman said the cause of a deadly blaze that left four people dead was not thought not to be suspicious.
A grandmother has described her devastation after her daughter and two grandsons were killed in a house fire in Chesterfield.
Josie Leighton, Jordon Green and Tyler Green died yesterday after a blaze at a house in North Wingfield in Derbyshire.
In a statement Lynn Leighton said: “Josie was a lovely, loving daughter who had lots of friends.
“Tyler was always happy. He loved life, he loved school and was always full of beans. Jordan was a real character. He loved his family, specially his grandma and always had lots of friends.
“They will all be greatly missed. We are devastated by what has happened and we ask for privacy at this time to allow the whole family to grieve.”
One of the victims of the house fire in Chesterfield "always had a smile on his face", his headteacher has said.
Jordan Green and his nine-year-old brother Tyler were pronounced dead at Chesterfield and District Royal Hospital following the fire at Williamthorpe Road, North Wingfield.
The 12-year-old's headteacher at North East Derbyshire Support Centre, Val Fisher, said: “Jordan had only been with us since September, but in that short time was making good progress.
"He was well liked by fellow pupils and staff and always had a big smile on his face. He enjoyed all the activities, and loved being part of a team. He was funny and sociable. We will all miss him.“
Tyler Green was a "thoughtful and considerate" boy who was a valued member of his school community.
The nine-year-old died in the fire along with his brother Jordan as well as two other women in the blaze near Chesterfield.
The statement from North Wingfield Primary School read:“Tyler was a valued member of our school community and we will all miss him. He was a quiet thoughtful, considerate boy who was polite and helpful.
“He had many good friends in school and in the community and this makes it all the more difficult to hear this news."
Investigations are continuing into what caused a house fire which killed two women and two children near Chesterfield.
Claire James, 27, and Josie Leighton, 32, were pronounced dead at the scene.
Two boys, Tyler Green, 9, and Jordan Green, 12, were also in the house and were taken to Chesterfield and District Royal Hospital, where they were pronounced dead.
The blaze broke out in North Wingfield early yesterday morning. A seven-year-old girl managed to escape with minor injuries. Post mortem examinations will take place today.
The victims of a house fire in North Wingfield, Derbyshire, have been named by police as Claire James, 27, Josie Leighton, 32, Tyler Green, 9, and Jordan Green, 12.
Derbyshire Police say Claire James and Josie Leighton died at the scene. The boys - Tyler and Jordan - were later pronounced dead at hospital.
A seven-year-old girl was taken to hospital following the fire, suffering from minor smoke inhalation. Police say she has since been discharged.
A joint investigation by the police and fire service continues.