Marathon star Jess Trengove and husband Dylan Stenson have welcomed the arrival of their first child over the weekend.

The athletic Adelaide couple are the proud parents of a boy, named Billy.

Jess Trengove and Dylan Stenson with their newborn baby, Billy. Photo: Instragram.com/jess_tren

Jess shared a gallery of precious photos, including her first hold, on her Instagram on Sunday night.

“Pure joy 👶🏼💙. Welcome to the outside world Billy boy ~ we love you SO much and feel incredibly grateful!” she wrote online.

Photo: Instagram.com/jess_tren

Jess was joined by sister Abbie and her children at her bedside.

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Cyclists Anna Meares and Annette Edmondson, AFL player Lachie Neale, netballer Erin Bell, and the ‘Iceman’ Greg Oddy were among her earliest well-wishers.

Congratulations Jess and Dylan, enjoy your new bundle of joy! 😍