African-American people assigned female at birth are more likely to have twins than any other race. Asian Americans and Native Americans have the lowest rates for twins. White people assigned female at birth have the highest rate of higher-order multiple births (triplets or more).
Race – African-American women are more likely to have twins than any other race. Asian and Native Americans have the lowest twinning rates. Caucasian women, especially those over age 35, have the highest rate of higher-order multiple births (triplets or more).
The central African country of Benin has the highest national average of twinning, with a whopping 27.9 twins per 1,000 births, the researchers added.
Twin birth rates declined among mothers aged 30 and over, with the largest declines among older mothers aged 40 and over. The twinning rate dropped 7% among non-Hispanic white mothers from 2014 to 2018 (34.3 in 2018), but was essentially unchanged among non-Hispanic black (40.5) and Hispanic (24.4) mothers.
In Australia, twins happen in 1 in every 80 births. This means that 1 in 40 Australians is a twin.
Researchers have long noticed that the Yoruba tribe — whose members live in Nigeria, Benin, Togo, and elsewhere — is a world leader in twins.
A woman is more likely to conceive twins if she or her partner has a family history of fraternal twins, if she's over the age of 30, overweight, and taller than average. It is important to note that some factors such as age and weight can increase other risk factors as well.
The rate keeps rising for (naturally) two big reasons. More twins are being born now than ever before. Parents are increasingly using in-vitro fertilization and deciding to have children later in life. The twin rate could continue to go up as more nations push these factors higher.
This belief is based on the assumption that twinning is genetic and runs in families. However, if that was truly the case—if there was a twin gene—then twins would occur with predictable frequency in those families that carry the gene. There is no concrete scientific evidence that suggests twins skip a generation.
Multiple pregnancy usually happens when more than one egg is fertilized. It also can happen when one egg is fertilized and then splits into 2 or more embryos that grow into 2 or more babies. When one fertilized egg splits into 2, the babies are called identical twins.
Race – African women have the highest incidence of twins, while Asian women have the lowest. Assisted reproductive techniques – many procedures rely on stimulating the ovaries with fertility drugs to produce eggs and, often, several eggs are released per ovulation.
Vietnam was the country with the fewest twins (6.2 per 1,000 births) and Benin was the country with the most (27.9 per 1,000). Over time, some of these developing countries saw increases in twins, but some saw decreases and some stayed the same, with any changes tending to be small.
A Russian woman named Valentina Vassilyeva and her husband Feodor Vassilyev are alleged to hold the record for the most children a couple has produced. She gave birth to a total of 69 children – sixteen pairs of twins, seven sets of triplets and four sets of quadruplets – between 1725 and 1765, a total of 27 births.
However, few genes appear to be definitively linked to hyperovulation, so it could just be that genetics in general on the mother's side contribute to the probability of having fraternal twins. Heredity on the father's side, on the other hand, does not increase a couple's odds of having twins.
Having identical twins is not genetic. On the other hand, fraternal twins can run in families. Genetics can definitely play a role in having fraternal twins.
If one identical twin has autism spectrum disorder (ASD), the other twin has a 76 percent chance of also being diagnosed with it. The numbers are lower for fraternal twins.
Typically, a mother will release one egg every cycle that is available for fertilization. However, in the case of fraternal twins, the mother may have released two eggs. As Mom ages, she may tend to release more than one egg every cycle.
Everyone has the same chance of having identical twins: about 1 in 250. Identical twins do not run in families. But there are some factors that make having non-identical twins more likely: non-identical twins are more common in some ethnic groups, with the highest rate among Nigerians and the lowest among Japanese.
In fact, one British study tested ESP potential among identical twins and found that they were correct about 25% of the time, the same as any other siblings. There is one particular power though which twins possess, longevity. Fraternal twins live longer than singletons and identical twins longer still.
The twinning rate in Asia and Latin America, on the other hand, is very low: often less than 8 per 1000 births and almost always less than 10 per 1000 births.
Why Do They Come Early? There are several reasons why so many twins are born prematurely. One is that the mother goes into labour spontaneously. We still do not know what triggers labour, or why membranes rupture without warning, and it is therefore very difficult to prevent premature labour from occurring.
The birth process is similar to giving birth to a single baby. If you're planning a vaginal birth, your health team may recommend that you have an epidural for pain relief.
Fertility treatments can play a big role in increasing the likelihood of having twins. In particular, assisted reproductive technologies such as in vitro fertilization (IVF) and ovulation-stimulating medications can make a person more likely to conceive twins.
Now an international research group has found that twin mothers are not actually more fertile than other women. On the contrary, when a woman gives birth several times, the chances increase that at least one of these births will be a twin birth. Twin mothers aren't supermothers, but have been given more chances."
Such twins, known scientifically as 'MoMo', an abbreviation for monoamniotic-monochorionic, are some of the rarest types of twins, making up less than one percent of all births in the United States, noted the statement. It also stressed that such MoMo twin pregnancies have a high risk of fetal complications.