Daniel and María joined hands shortly after their birth in a hospital in Guipúzcoa in the Basque Country of Spain. The result of this union took the Internet by storm.
According to the Basque daily newspaper Diario Vasco, Daniel and María were no ordinary twins, right from the start.
Although they are the result of a healthy pregnancy, and were probably able to feel each other's presence in the womb, they could not physically touch each other, due to being in separate amniotic sacs.
However, nothing in their nine months of getting ready for the world suggested that they would become famous at birth.
During the mother's delivery, the babies were in a breech position, making the doctors at the Guipúzcoa Hospital decide to deliver them by caesarean section. Once they were born, the babies were placed side by side in a thermal cot.
At this point, the doctors and nurses were amazed and captivated by what they saw - the newborn siblings joined hands.
The twins' father, Mario said: "They [the staff] asked for my mobile phone because they wanted to take a beautiful photo." And apparently in the end they took three images of the twins.
The photos show Daniel and María turned away from each other and still unable to see. The babies were awaiting the first touch from their mother, but had already joined their hands.
Dr. Rodríguez asked the parents for permission to hang the photo in his office saying, "I've seen a lot of births and I've seen a lot of newborns but I've never seen that before."
Four months down the line, father Mario says his babies , "don't hold hands any more but when they see each other they smile."
"The day they held hands they signed a contract to be together forever."