The process by which we go from being a sperm to becoming a fully formed person with a thinking mind and a fully functional body is, no matter how much science says, a miracle. And during that same process, many things can happen so that the final result, a beautiful and healthy baby, is not as we all hope.
10 Births that the parents did not expect
1- Vestigio de cola
More people than you think are born with tail, the only thing that is not a big problem since you can operate surgically with ease.
Perhaps they are Goku was not from a planet as far as we thought.
2- Craniopagus Parasiticus
It happens when the process of dividing two twins does not take place completely, as a consequence only a second head adhered to the main one develops with a face, not very well developed, and without limbs.  3- Sirenomelia
Better known as the Mermaid Syndrome, it is surprisingly striking for the union of the legs who suffers It is very unlikely that your child will suffer and is usually discovered during pregnancy, although the chances of reaching term are very low.
4- Senile Childhood
The strange case of Benjamin Button was not all fiction. There is a genetic disease that causes children to age abruptly and prematurely during their first and second year of life. Not only remains outside, this disease affects muscles and bones equally.
5- Fetus to the square