Police have released the name of the two-year-old Cromwell boy who died suddenly on Wednesday night.
He was Riley Michael Brown.
• Cromwell toddler dies suddenly
Sergeant Ian Kerrisk, of Alexandra, said all the emergency services were involved in the call-out and the attempts to resusciate the boy were unsuccessful.
"We are full of praise for the efforts of all those who attended. It was an emotional time for everyone involved,'' he said.
The death was not suspicious. It has been referred to the coroner.