A 27-year-old woman arrested on suspicion of attempted murder this morning is no longer in hospital, but is instead receiving treatment at an "appropriate facility", police say.
The woman suffered knife wounds and was initially taken to the Royal Gwent Hospital in Newport.
Two children - a seven-year-old boy and a 16-month-old baby girl - remain in a stable condition at the Royal Gwent Hospital, where they have been receiving treatment after suffering knife wounds in an incident at Salisbury Close.
A 16-month-old baby girl and a seven-year-old boy taken to hospital with injuries this morning are said to be in a stable condition, according to police.
A woman has been arrested on suspicion of attempted murder.
Gwent Police Chief Superintendent Mark Warrender said the incident was tragic and urged members of the public to come forward with information.
Speaking to reporters outside the force's central station in Newport, he refused to comment on the relationship between the woman and the children, but he said both youngsters and the arrested woman sustained knife injuries.
Specialist officers are offering support to the family, he added.