A woman and two men have appeared in court charged in connection with the death of her 17-month-old son.
Tracey Connolly, 25, and Stephen Barker, 31, from north London, are accused of murder and allowing or causing the death of a child under 16.
Mr Barker's brother Jason, 35, is charged with allowing or causing the death of a child under 16.
They were remanded into custody by Highgate magistrates until a hearing at the Old Bailey on 23 November.
The boy, named Peter, was declared dead at North Middlesex Hospital, north London, on 3 August.
A post-mortem examination carried out at Great Ormond Street Hospital proved inconclusive and further tests were due to be carried out.
Detectives were called to the hospital after concerns were raised by staff, a Metropolitan Police spokesman said.
Miss Connolly and Steven Barker, who live in Penhurst Road, Tottenham, and Jason Barker, of Wittersham Road, Bromley, south-east London, all appeared in court on Friday.