Nicholas Baxter had pleaded not guilty to murdering his six-week-old son on November 3, 2011.
Matthew Baxter suffered brain hemorrhaging and 17 rib fractures before he died, ABC News reported.
Baxter was cleared of a murder charge, but found guilty of manslaughter by a Supreme Court jury in Townsville on Monday.
He is due for sentencing on Tuesday.
The Court heard Baxter had called Bluewater Medical Practice in Townsville on November 3 to report his son was unwell.
He had been alone with the baby while his wife was away.
Baxter denied he was responsible for the baby’s death throughout the trial.
This article originally appeared on New Idea.