Amy Elliot was born in Waterford, Ireland, on June 1, 2012, four months premature. She weighed just over one pound, and she spent a great deal of time in an incubator until she was strong enough to survive on her own. In the meantime, Amy’s twin-to-be, Katie, remained in the womb. The twins’ parents decided that, after hours of labor, they would let nature take its course.

Doctors say that surviving as a twin born at 23 weeks is incredible enough, but the story doesn’t end there. After three difficult and stressful months, Katie Elliot was born. The Elliot twins were born 87 days apart, setting the world record for longest amount of time between the birth of twins. The previous record was set in 1995 and 1996, when twins in Pennsylvania were born 84 days apart.