“His smile lights up a room,” Mollie Keen says about her son, Nash, who has just celebrated his first birthday. A year ago she didn’t know if he would ever leave a hospital. He was born at 21 weeks — 133 days premature. Nash is now the youngest of survivors.

“He was just so young,” Mollie remembers. She and her husband, Randall, were hopeful, but the doctors were trying to help them be realistic all along the way, too. Nash’s heart, his brain — everything was........

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