An Iowa boy who was born at just 21 weeks is now the Guinness World Records title holder for the most premature baby. Nash Keen, of Ankeny, turned one year old on July 5th as family members celebrated the giggly baby’s milestone,

Although most studies measuring premature-baby outcomes start at 22 and 23 weeks — reporting U.S. survival rates between 10 and 20 percent at that gestation — University of Iowa Health Care is among the few hospital systems that take on babies at 21 weeks.