This is the heartwarming moment a dad crossed a finish line with his five-month-old son - who survived two weeks in the NICU.

Paul Sahlburg, 32, ran 14km last Friday (April 4) as part of the Good Friday Appeal, which raises money for the Royal Children's Hospital in Melbourne, Australia.

Paul and his wife Ashlee Sahlburg, 30, spent two weeks in the NICU there with their son Navy, now five months old, after he was diagnosed with meconium aspiration syndrome.

After their experience, the couple felt compelled to give back and Paul, an avid runner, saw the annual charity event as the perfect opportunity.