Yaseen's father Yousef Ege, 38, denies causing his death by failing to protect him.
He died the following month and Craig Robinson, from New Arley, was charged with causing his death by careless or inconsiderate driving.
Douglas Calder, 38, denies causing his death by driving dangerously.
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The court was told on Friday that Mr Macia had suffered extensive injuries, culminating in hypoxia - a lack of oxygen supply to the body - causing his death.
Cunningham admitted causing his death by dangerous driving.
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Peter's mother, her boyfriend Steven Barker and his brother Jason Owen were jailed last year for causing or allowing his death.
Stephanie Whelan, 27, the boy's mother, denies causing or allowing his death.
Her husband, Yusef Ali Ege, 38, is on trial with his wife, accused of causing or allowing the death of his son by failing to act.
Evans initially denied causing death by dangerous driving but changed his plea to guilty at the court hearing on Tuesday.
He pleaded guilty to dangerous driving but did not face the more serious charge of causing death by dangerous driving because no causal link could be established between his texts and the crash.
Peter's mother Tracey Connelly, her boyfriend Steven Barker, and his brother Jason Owen were jailed in May 2009 for causing or allowing the child's death.
His mother, Tracey Connelly and her boyfriend, Steven Barker, and his brother Jason Owen were jailed in May 2009 for causing or allowing the child's death.
Noel Young, of Metal Bridge, near Carlisle, was serving a sentence for causing death by dangerous driving when he ran the drugs operation using three mobile phones from his cell.
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