PHILADELPHIA,Pa.- Formerly conjoined twins girls who spent 485 days in a Philadelphia hospital were released on Monday.

WWL-TV reports that Erin and Abby Delaney were born 10 weeks premature on July 24, 2016 at the Children's Hospital of Philadelphia. The duo was joined at the top of their heads, and at 10 months were separated by a team of 30 medical professionals, according to a statement from the hospital.

Erin and Abby's surgery lasted 11 hours and marked the 24th time that surgeons at the hospital have separated a pair of conjoined twins, according to WWL.

“As their parents, it is very neat for Riley and me to have a front-row seat to this and watch them overcome these incredible obstacles," Heather Delaney, the twin's mother, said in a statement. "We cannot wait to see what their future holds."

According to the hospital, the girls will require additional surgeries as they grow older, and medical staff will continue to monitor their health.