A Woman Whom Has Had Twins Whats the Odds of Her Getting Twins Again
A lot of people wonder what their chance is of having twins.
You might have heard that twins "run in families". And that can be true! Compared with the general population, women with a mother or sis who have had twins are twice as likely to have twins themselves.
Nascency of twins has significantly increased over the past years, as you lot can see on the graph below.
As of 2003, there are on boilerplate around 16 sets of twins born per 1,000 births in the United States.1 It is estimated that ane in 250 natural pregnancies will naturally result in twins.2
While twin pregnancies can happen by take chances, at that place are some factors that may increment your odds of having 2 babies at the same fourth dimension. Let'due south acquire about twins!
There are ii types of twins
Identical twins
Identical twins come up from a single egg that was fertilized by a single sperm, which then divided into two split up embryos very early in the pregnancy.
Since both started out as the same cell, they share the same Deoxyribonucleic acid. This is why they often look identical! And they volition always be the same sex activity, either both boys or both girls.
The chances of having identical twins is relatively rare: 3 or iv per every i,000 births.1
(Correct epitome of identical twin girls from Wikimedia )
Fraternal twins
Congenial twins result when ii different eggs are fertilized, each by a different sperm cell. This tin can happen when a woman produces several eggs (most often two) at the aforementioned time. This is called hyperovulation.
Fraternal twins don't share the same Deoxyribonucleic acid. They are no more related than regular siblings!
Just like regular siblings, fraternal twins won't necessarily exist the aforementioned sex. They can be two boys, two girls, or a boy and a daughter. And they may or may not await alike, but like brothers and sisters born years apart!
(Right image of fraternal twins Mary-Kate and Ashley Olsen from Wikimedia)
Are at that place factors that increase your odds of having identical twins?
No. As far equally we know, identical twins are completely random! Virtually of the time, the cause of identical twins is unknown.
Are there factors that increase your odds of having fraternal twins?
Yes! There are several things that tin increase the odds of congenial twins.
Genetics
A woman's chances of having fraternal twins may be higher if fraternal twins run in her family. In that location are some genes that predispose women to hyperovulation (releasing multiple eggs).i If this occurs, there is a fair hazard of a congenial twin pregnancy.
The genes for hyperovulation can be inherited. So if congenial twins run in a woman's family, she may be more likely to take fraternal twins herself. If a adult female'southward sis has congenial twins, she is about 2.5 times more likely to take twins herself. If a woman's mother has fraternal twins, she is about ii times more than probable to have twins.ane
This is why we often say the "risk" for having twins comes from the female parent. It doesn't matter if the dad as well has congenial twins in his family – his DNA won't influence how many eggs the mom releases!
Age
Older women generally have a higher chance of conceiving twins. A 35 twelvemonth old woman is nearly 4 times more than likely to take fraternal twins than a 15 year old! That is because they are experiencing some hormonal changes as they nearly menopause. This could encourage their torso to release more than one egg during ovulation.1
Height
Taller women are slightly more than likely to have twins. Women who are at least 5'4" alpine are near i.v-2 times more probable to have twins than women who are 5'1'' or shorter. Researchers call up that this might be related to having a higher quantity of a certain poly peptide. This protein is released in response to growth factor and makes the ovaries more sensitive to follicle stimulating hormone.1
Weight
Women who are overweight also seem to have a higher hazard of conceiving twins, especially if their BMI (body mass alphabetize) is to a higher place 30.1 On the other hand, women who are underweight (BMI < xviii.5) have a smaller likelihood of having twins.
Nutrition
This may sound crazy, simply it looks similar nutrition tin can also accept an bear upon on your risk of having twins. A study showed that diets that include animal products, particularly dairy, enhance the odds of a multiple pregnancy.3 Information technology tin actually arrive up to 5 times more than probable! This seems to be due to more growth hormone, increasing the concentration of a certain poly peptide that stimulates ovulation.
Ancestry
If you lot meet thirty people of European ancestry, 1 of them is likely to have a twin brother or sister. On the other mitt, y'all have the lowest take chances of meeting a twin in Asia, where 1 in 70 people is a member of a twin pair. And you have the highest take a chance to meet a twin in Nigeria, where 1 in 12 people has a twin sis or brother!1
Previous birth
Your chance of having twins also increases if you accept had a child before.1
In vitro fertilization
Over the by few years, in that location has been a significant increment in the apply of assisted reproduction treatments. Fertility treatments such as in vitro fertilization (IVF), intra-uterine insemination (IUI) and ovulation induction (OI) are i of the main causes of the steep increase in twin nascence.ane
The takeaway
The likelihood of conceiving twins is a complex trait. There is no manner to predict precisely if you lot will or will non accept twins. And in that location is nothing that yous can practise to ensure a twin pregnancy.
Everyone has a adventure of having twins. Some people'south chances are merely a bit higher than others!
Source: https://www.thetech.org/ask-a-geneticist/what-are-my-chances-having-twins
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