The trial of two heroin addicts accused of killing their baby son with an overdose of methadone has been halted.
Mark Bate and Gemma Fennelly deny killing their son
Mark Bate, 33, and 23-year-old partner Gemma Fennelly are charged with the manslaughter of 22-month-old Mitchell Bate in Hartlepool in September 2005.
On Tuesday, Judge Peter Fox told the jury at Teesside Crown Court that there had been some complications with expert evidence due to be heard.
A new trial is now due to be held in April 2007.
The court was due to hear from toxicology experts, but Judge Fox said there had been problems with the evidence and they would require further investigation.
He said it was regrettable but stressed that the facts needed to be right before a trial could proceed.
The defendants both deny the manslaughter of their son.