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Dizygotic (fraternal) twins can be caused by a hyperovulation gene in the mother. [8] Although the father's genes do not influence the woman's chances of having twins, he could influence his children's chances of having twins by passing on a copy of the hyperovulation gene to them. Monozygotic (identical) twins do not run in families.
The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...
I Was Having Twins. Briana Pozner. January 31, 2025 at 8:18 AM. ... After all, shortly after the fateful ultrasound, I discover that the odds of us having gotten spontaneously pregnant with twins ...
Things I learned (from my doctors and my own reading) after I found out I was having twins: 1. At age 35, a woman’s odds of having a multiples pregnancy drastically increases…and it continues ...
Rosie Swain naturally gave birth to twins, girl and boy, Diana and Christian, in USA on April 20, 2005, at the age of 57. Swain and her husband Jay, who already were six times grandparents and four times great-grandparents, by her six eldests, decided to go through IVF in order to give their last child, 6-year-old son Jimmy, a sibling close in age.
The babies were born on November 20 via cesarean section
Hellin's law, also called Hellin-Zeleny's law, is an empirical observation in demography that the approximate rate of multiple births is one n-tuple birth per 89 n-1 singleton births: twin births occur about once per 89 singleton births, triplets about once per 89 2, quadruplets about once per 89 3, and so on.
‘I was actually really shocked to find out we were having four girls and a boy’ Mother of quintuplets thought she was just having twins: ‘Not even my doctor suspected this could’ve happened’