WA man fights baby son manslaughter charge

A 21-year-old man will face trial over a high-speed freeway crash in Perth that killed his three-month-old son and seriously injured his partner.

James Farmer, who is on bail, faced Stirling Gardens Magistrates Court via video link from Katanning Courthouse on Wednesday, when he entered not guilty pleas to manslaughter and dangerous driving causing grievous bodily harm.

James Farmer Junior and his mother Oraleigh Tirohea Aroha Raukawa were thrown from the vehicle when it crashed on Kwinana Freeway in Baldivis just before midnight on April 20 last year.

People stopped to provide emergency first aid until police and paramedics arrived but the baby died in hospital.

Ms Raukawa suffered serious head injuries.

Farmer did not enter a plea to a drink driving charge, with the court hearing his blood alcohol level was 0.122.

He will next face court in July.