Conjoined twins occur once in every 50,000 to 60,000 births. Approximately 70 percent of conjoined twins are female, and most are stillborn. Approximately 75 percent of conjoined twins are joined at least partially in the chest and share organs with one another.

What percentage of conjoined twins survive?

Conjoined twins generally have a poor prognosis. The total survival rate is 7.5%. Only 60% of the surgically separated cases survive.

How many sets of conjoined twins are born each year?

However, of the approximately 200 sets of conjoined twins born each year, about 3 or 4 sets have a non-conjoined triplet, and this sibling can be either identical or fraternal.