Day Fourteen of Twinipedia:
Fact #14
How do Identical twins happen?
"Identical (or monozygotic) twins happen when a fertilized egg splits into two separate babies - usually within the first twelve days of Mom's pregnancy. After twelve days, the egg may not split entirely and result in conjoined twins. Some people theorize that the later in the pregnancy the egg splits (between days 8 and 12), the more likely the twins will have similar characteristics since they had the additional time to lay "identical" genetic groundwork.
My Great Source of Info. - baby.families.com - http://baby.families.com/blog/ode-to-twins-and-supertwins-28-interesting-facts-about-multiples#
"Identical (or monozygotic) twins happen when a fertilized egg splits into two separate babies - usually within the first twelve days of Mom's pregnancy. After twelve days, the egg may not split entirely and result in conjoined twins. Some people theorize that the later in the pregnancy the egg splits (between days 8 and 12), the more likely the twins will have similar characteristics since they had the additional time to lay "identical" genetic groundwork.
As far as scientist can determine, there is no reason why the egg splits - it's a spontaneous and random occurrence. One theory is the egg ovulated by maternally mature women (Moms over 35) is not as flexible as it is in younger moms. When a fertilized egg begins its natural division process in creating a baby, the egg actual 'breaks' (or splits) into two instead of dividing."
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