A caring, intrepid team of doctors halfway around the world who could save that baby's life.
And watching that wide-eyed baby giggle with his 3-year-old sister.
They're the moments that make the parent of a child with a disease so rare he's just one of 14 people in the world who have it thankful.
"I think life throws a lot of curveballs, and this is definitely one of them," said Jenna Buswell, the mother of 9-month-old Casen Buswell.
(Courtesy: Jenna Buswell)