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Gemellology - Facts about Multiples Like Twins, Triplets, and More
Twin Research and Human Genetics 9 4:
The incidence of twin types and genders are oddly symmetrical.
For the Mayans, identical twins were seen as a blessing from God and a sign that they shared one soul which had been split between the two. They are always identical as they derive from one egg that for unknown reasons has failed to divide fully into identical twins.
List of multiple births - Wikipedia
Multiple birth - Wikipedia
What are the risks associated with having twins or triplets? Retrieved November 13,
The former result from a single fertilized egg or zygote splitting into two or more embryos, each carrying the same genetic material.
Retrieved February 15, Centers for Disease Control and Prevention, accounting for only about sets in 3.
See separate leaflet called Premature Labour. You're more likely to have a vaginal birth if the first twin is in a head-down position cephalic.