One year ago, Nash Keen was born weighing less than a grapefruit and measuring just 24cm long. It was 133 days before he was due to arrive, and once he was resuscitated, Nash was rushed to the NICU ward at the University of Iowa Health Care hospital.

A 1-year-old who was born at 21 weeks has been named the world's most premature baby by Guinness World Records.

Nash Keen was born prematurely weighing just 10 ounces — less than a can of soda — and doctors doubted he would survive. He recently had his first birthday.