Another expert witness testified in court in St. John's Tuesday that bleeding on baby August Matchim's brain was not caused by shaken baby syndrome.

Testifying by video link, pediatric radiologist Dr. Julie Mack told a St. John's courtroom that the baby could have had what amounted to a stroke.

She said no one could generate enough force simply by shaking the baby to cause the bleeding on the brain that August Matchim had suffered.

Baby's father convicted of shaking and injuring baby

August Matchim's father, Colin, was convicted in May 2011 of shaking and severely injuring his infant daughter in 2009.

Matchim had confessed to shaking his daughter. However during his trial, he retracted his confession.

Matchim said he believed that if he didn't confess, neither he nor his former partner would get custody of the baby.

Sentencing put on hold

Matchim's sentencing was put on hold for more than a year because his new lawyers wanted to put expert evidence before the court to show that the injuries to his baby daughter could have happened some other way.

Last week, neuropathologist Dr. David Ramsay told the court that August Matchim's injuries were consistent with shaken baby syndrome, but could have also been caused if  the infant had a pre-existing condition that interfered with the flow of blood in her brain.

Ramsay also noted that August didn't show any external signs of trauma, such as bruising or cuts.