ID=23870155HOUSTON – Elysse Mata still remembers the day a doctor told her she was pregnant with conjoined twins.

It was Jan. 13, 2014, and she was 19 weeks pregnant.

It wasn't long after—12 weeks later on April 11, to be exact—that Mata gave birth to Knatalye Hope and Adeline Faith Mata, twin girls joined at the chest and abdomen.

After only 10 months of living conjoined, a team of doctors at Texas Children's Hospital successfully separated the girls during a 26-hour surgery Feb. 17.

It was a trying surgery for doctors, who had to separate the Knatalye and Adeline from the chest wall, lungs, pericardial sac (the lining of the heart), diaphragm, liver, intestines, colon and pelvis.

More: Hope, faith strong for conjoined twins at Texas Children's Hospital

"This surgery was not without its challenges with the girls sharing several organ systems. Our team has been preparing for this surgery for months, and we've done everything from working with our radiology experts to build a 3-D model of their organs, to conducting simulations of the actual separation surgery," said Dr. Darrell Cass, pediatric surgeon and co-director of Texas Children's Fetal Center.

It took doctors roughly 18 hours to separate the two, while doctors worked on Knatalye for 23 hours and 26 on Adeline. Specialty doctors from pediatric surgery, plastic surgery, cardiovascular surgery, urology, liver transplant surgery, orthopedic surgery and pediatric gynecology assisted in the surgery.

Knatalye and Adeline will be overseen by a Pediatric Intensive Care Unit during their recovery for the ensuing months. Doctors said they expect they'll undergo additional surgeries in the future. Doctors said they're unsure of a possible release date.

"We are so grateful to all the surgeons and everyone who cared for our daughters and gave them the incredible chance to live separate lives," Mata said. "We know how much planning and time went into this surgery and we are so blessed to be at a place like Texas Children's where we have access to the surgeons and caretakers that have made this dream a reality."