The remains of a baby have been found in the search for the missing child of Constance Marten and Mark Gordon.
Police said the body had been found in a wooded area of Brighton, close to where the couple were arrested on Monday.
“I understand that the conclusion of this search will be heartbreaking for the local community and the wider public,” said Det Supt Lewis Basford.
Missing baby – live updates: Baby’s body found in woodland
A crime scene is in place where the body was found and a post-mortem examination will be carried out.
Marten and Gordon were detained in Brighton on Monday on suspicion of child neglect after a member of the public spotted them at a shop.
They were further arrested on suspicion of gross negligence manslaughter on Tuesday.
Since then, more than 200 police officers have been looking for the child in allotments and woodland in and around Brighton.
Marten, 35, and Gordon, 48, were reported missing on 5 January after their car caught fire on the M61, near Bolton.
It is believed Marten had given birth just a few days before and that the child had not received any medical checks.
Over the following days, there were sightings of them in places including Liverpool, Essex, south London and Sussex.
Authorities believe they had been sleeping rough in a tent and had avoided detection by only making payments in cash, hiding their faces, and often moving around at night or in the early hours.