Abby and Erin Delaney, conjoined twins born in North Carolina, were separated at the head in an 11-hour surgery in June 2017 despite being given just a two percent chance of survival. They were born at 30 weeks in July 2016 and weighed just six pounds combined. The girls suffer from developmental delays but are approaching their seventh birthday and thriving.

Both girls have just graduated from kindergarten, an achievement their parents never thought possible. Twins born conjoined at the head are known as craniopagus conjoined twins, the least common form of conjoined twins, and doctors told their parents their chance of having them was just one in 2.5 million.