A non-fatal collapse is when a baby’s condition severely and suddenly declines but the infant survives.

Ms Letby, whose Facebook page has photos of cats and shows her beaming broadly on nights out with friends, is believed to have been arrested at her home yesterday.

According to The Times, a conviction for eight murders would make Ms Letby Britain’s most prolific child killer.

Detective Inspector Paul Hughes said Ms Letby was arrested early on Tuesday (British time) and remained in custody.