
"... The embryos of identical twins start to separate around eight to 12 days after forming. It’s thought that if this separation process starts later than this, between 13 and 15 days after fertilization, it results in conjoined twins, according to the Mayo Clinic.
There is also a theory that conjoined twins can result from an egg that first splits completely, but then joins back together, according to Seattle Children’s Hospital.
Conjoined twins occur in about one out of every 200,000 live births, and many do not survive the first day of life, the University of Maryland says. Researchers estimate that 40 to 60 percent of conjoined twins are stillborn.
Craniopagus twins are rare, making up only 2 percent of conjoined twin cases, the University of Maryland says. ..."
For more information, please see the full article-- https://reachmd.com/news/what-causes-some-twins-born-conjoined/1295642/
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