Doctors successfully separated 10-month-old conjoined twins after a 26-hour surgery last week at the Texas Children’s Hospital in Houston.

The twins, Knatalye Hope and Adeline Faith Mata, shared multiple organs, including lungs, diaphragm, liver, intestines, colon, and chest wall, among others. Despite being in critical condition, lead surgeon Dr. Darrell Cass is optimistic that the pair will survive.