A man and a woman have been arrested on suspicion of the murder of a two-year-old boy.
Mitchell Bate was found dead at his home in Rodney Street, Hartlepool, on 16 September, Cleveland Police said.
Det Ch Insp Gordon Lang said the arrests of a 23-year-old woman and a 33-year-old man followed the results of detailed forensic tests.
They are currently being held at a police station where they are helping police with their inquiries.
RELATED INTERNET LINKS:
The BBC is not responsible for the content of external internet sites