The mother, stepfather and a teenage acquaintance of Queensland toddler Mason Lee have been committed to stand trial for his manslaughter.

Mason was just 21-months-old when he died in 2016 from a rupture to his small intestine, believed to have been caused by blunt force trauma.

Mason Lee was found dead at a Caboolture home, north of Brisbane, on June 11.

After a two-day hearing, Anne Maree Lee, William Andrew O'Sullivan and Ryan Robert Barry Hodson were on Tuesday committed to stand trial in the Brisbane Supreme Court at a later date on the charge of manslaughter.

The hearing was told Mason was covered in bruises when his lifeless body was handed over a fence to a paramedic in the early hours of June 11.