Conjoined twins are rare, but it's even more unusual for them to share one body. Doctors haven't yet decided whether these two baby girls can be separated http://cnn.it/2fxLmis | CNN

Why Do Conjoined Twins Happen? | Causes of Conjoined Twins Explained Ever wondered why conjoined twins are born? This short video explains the scientific and medical reasons behind conjoined twins, how they form inside the womb, and what makes this rare condition happen. Learn about the early stages of embryo development, the role of identical twin formation, and why the split sometimes remains incomplete. Perfect for students, parents, and anyone curious about human anatomy and pregnancy. #Conj

5.7K views · 161 reactions | Watch a sneak peek of Discovery Life Channel's "Conjoined Twins: Miracle Separation" which follows the Mata conjoined twins journey from birth through separation at Texas Children's. Tune in tomorrow night at 9/8C for the full documentary! | Texas Children's Hospital | Facebook

Conjoined twins Miracle and Testimony, who were joined at the pelvis, were separated during 18 hours of surgery -- days ahead of their first birthday: http://4.nbcla.com/gmYcUnI | NBC LA

WATCH: Conjoined twins see each other face-to-face for the first time after their 17-hour separation surgery. http://on.today.com/2hABhAe | NBC Nightly News with Tom Llamas