Constance Marten and her partner Mark Gordon disappeared back in January after she gave birth to a child, and now an urgent search is being conducted for the baby.
The pair were located by officers from Sussex Police in Stanmer Villas, Brighton on Monday, February 27 after a member of the public reported seeing them shortly before 9.30 pm.
The couple were arrested on suspicion of child neglect and remains in custody, with the Metropolitan Police relaying that they are being questioned.