Lady Louise Windsor (Louise Alice Elizabeth Mary Mountbatten-Windsor; born 8 November 2003) is the elder child and only daughter of Prince Edward, Earl of Wessex, and Sophie, Countess of Wessex. She is the granddaughter of Queen Elizabeth II and Prince Philip, Duke of Edinburgh. When Lady Louise was born, she was 8th in the line of succession to the British throne. Following the birth of her brother and the Duke and Duchess of Cambridge's children, she is 11th in the line of succession.
Lady Louise was born prematurely on 8 November 2003 (at 23:32 GMT) at Frimley Park Hospital in Surrey after her mother was rushed there by ambulance from the Wessex home at Bagshot Park, Surrey; Prince Edward was not present for the birth because it came so suddenly. Lady Louise was delivered by the Royal Surgeon and Gynaecologist Marcus Setchell via emergency Caesarean section due to placental abruption, which caused severe blood loss to both child and mother. Louise was transferred to a neo-natal unit in St George's Hospital, Tooting, London, as a precaution. Meanwhile, her mother remained at Frimley Park until she was well enough to be discharged, on 23 November 2003. Lady Louise's name was announced on 27 November. She was baptised in the private chapel of Windsor Castle on 24 April 2004.