George took to Instagram to announce that his wife had given birth to the tiny tot at 10.51pm on Saturday night.
The 24-year-old athlete uploaded a photo of his wife and their son and captioned the pic: "Boston Mark Burgess April 8, 2017 @ 10:51pm 56cm / 4.08kg 👶🏼😍 @joanna.m.burgess is an absolute machine, Our little boy, well he is just perfect isn't he!"
George also shared a snap of the baby on his Instagram story, writing: "What a little champion our boy is!"
The happy couple, who have been dating since 2014 got married on December 3 2016 in an intimate ceremony in Noosa.
Congratulations to the new parents!