"No one really knows the incidence".

Identical triplets or quadruplets are very rare and result when the original fertilized egg splits and then one of the resultant cells splits again (for triplets) or, even more rarely, a further split occurs (for quadruplets). The odds of having identical triplets is unclear. News articles and other non-scientific organizations give odds from one in 60,000 to one in 200 million pregnancies.

Quadruplets

Quadruplets are much rarer than twins or triplets. As of 2007, approximately 3,556

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