Felicia Boots (above) has admitted killing her two babies who were found dead at the family's upmarket home.
She pleaded guilty to the manslaughter of 10-week-old Mason and his 14-month-old sister Lily in May.
The 35 year-old will not face murder charges after her plea on the grounds of diminished responsibility was accepted by the prosecution at the Old Bailey.
Mrs Boots, who trained as a hairdresser, was unable to appear at two previous hearings.She had been detained at a psychiatric unit and the prosecution's decision followed consideration of doctors' reports.
More top news
A London couple have been given legal backing to push for opposite sex couples to be granted the right to have civil partnerships.
David Haines' daughter tells ITV News families of IS victims will not get closure until there is a "bullet between the eyes" of Jihadi John.
The Essex boy will be racing for a new team - Manor - after the team formerly known as Marussia came out of administration.