All Blacks star Aaron Smith's newborn son "shares" sweet farewell to his dad for Rugby World Cup

All Blacks star Aaron Smith has had to say farewell to his newborn son less than a week after Luka was born, as he heads off for the Rugby World Cup.

Smith and his partner Teagan Voykovich welcomed their baby son into the world on August 28 in Dunedin.

But the new dad has already had to say goodbye to his son as the All Blacks prepare to take on Tonga in Hamilton on Saturday, before leaving for the Rugby World Cup in Japan.

Taking to her Instagram story, Voykovich shared a photo of the All Black halfback cradling the newborn along with a message written on behalf of Luka.

"Saying goodbye to Dad. Today at only five days old...by far the hardest things we've ever had to do," she wrote.

"You are so strong @aaronsmith_1112 the sacrifices you make for our little family never go unnoticed and we are so proud of you.

"I'm going to miss you so much (especially my pro night time nappy changer). We will be thinking of you every single day. See you in six weeks time, my love," she continued.

Smith announced the exciting news his son had arrived last week by posting a heartfelt picture to Instagram of him carrying Luka home from the hospital.

"Welcome to the world beautiful boy - Luka Fox Smith - 28-8-2019," he captioned the adorable snap.

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Smith and Voykovich, who got engaged in March this year, revealed that they were expecting at the same time with a sonogram of their baby.

After being part of the All Blacks side to lift the Webb Ellis Cup in 2015, Smith will be seeking his second World Cup title in Japan next month.

Go the All Blacks!