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Chances of having girl and boy twins

Recently we looked at the question of how likely a two-child family with a boy is to have another boy or, to the contrary, to also have a girl. Searching for those questions turned up another one of interest involving the gender of a pair of siblings: How do things change when they are twins? Her husband used the same basic model we used in The Other Child : there are four equally-likely possibilities in a two-child family, based on birth order. But Melissa disagrees with this model, because twins are the same age. Is she right?

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SEE VIDEO BY TOPIC: SIGNS OF HAVING A BOY VS GIRL - How to Predict Baby Gender - Old Wives Tales About Gender & Tests

What Are Your Chances of Having Twins?

What are my chances of having twins? My dad is a fraternal twin, and my aunt just got pregnant with fraternal twins. And that can be true! Compared with the general population, women with a mother or sister who have had twins are twice as likely to have twins themselves. Birth of twins has significantly increased over the past years, as you can see on the graph below.

Image credit: CDC. As of , there are on average around 16 sets of twins born per 1, births in the United States. While twin pregnancies can happen by chance, there are some factors that may increase your odds of having two babies at the same time.

Identical twins Identical twins come from a single egg that was fertilized by a single sperm, which then divided into two separate embryos very early in the pregnancy. Since both started out as the same cell, they share the same DNA. This is why they often look identical!

And they will always be the same sex, either both boys or both girls. The chances of having identical twins is relatively rare: 3 or 4 per every 1, births. Image from Wikimedia.

Fraternal twins Fraternal twins result when two different eggs are fertilized, each by a different sperm cell. This can happen when a woman produces several eggs most often two at the same time.

This is called hyperovulation. They can be two boys, two girls, or a boy and a girl. And they may or may not look alike, just like brothers and sisters born years apart!

Mary-Kate and Ashley Olsen are fraternal twins! As far as we know, identical twins are completely random! Most of the time, the cause of identical twins is unknown. There are some genes that predispose women to hyperovulation releasing multiple eggs. The genes for hyperovulation can be inherited! Age Older women generally have a higher chance of conceiving twins. A 35 year old woman is about 4 times more likely to have fraternal twins than a 15 year old!

That is because they are experiencing some hormonal changes as they near menopause. This could encourage their body to release more than one egg during ovulation.

Height Taller women are slightly more likely to have twins. Researchers think that this might be related to having a higher quantity of a certain protein. This protein is released in response to growth factor and makes the ovaries more sensitive to follicle stimulating hormone. Weight Women who are overweight also seem to have a higher chance of conceiving twins, especially if their BMI body mass index is above Diet This may sound crazy, but it looks like diet can also have an impact on your chance of having twins.

A study showed that diets that include animal products, particularly dairy, enhance the odds of a multiple pregnancy. This seems to be due to more growth hormone, increasing the concentration of a certain protein that stimulates ovulation. Ancestry If you meet 30 people of European ancestry, one of them is likely to have a twin brother or sister. On the other hand, you have the lowest chance of meeting a twin in Asia, where 1 in 70 people is a member of a twin pair.

And you have the highest chance to meet a twin in Nigeria, where 1 in 12 people has a twin sister or brother! Previous birth Your chance of having twins also increases if you have had a child before! In vitro fertilization Over the past few years, there has been a significant increase in the use of assisted reproduction treatments. Fertility treatments such as in vitro fertilization IVF , intra-uterine insemination IUI and ovulation induction OI are one of the main causes of the steep increase in twin birth.

The takeaway: The likelihood of conceiving twins is a complex trait. There is no way to predict precisely if you will or will not have twins. And there is nothing that you can do to ensure a twin pregnancy.

Do I have an increased chance of having twins? GHR: Is the probability of having twins determined by genetics? NHS: Do twins run in families? Below are a few that are especially relevant to this article:. The Tech Interactive S. Market St. San Jose, CA Federal ID Its content is solely the responsibility of the authors and does not necessarily represent the official views of Stanford University or the Department of Genetics.

The Tech Interactive. Back to. Image credit: CDC As of , there are on average around 16 sets of twins born per 1, births in the United States. There are two types of twins Identical twins Identical twins come from a single egg that was fertilized by a single sperm, which then divided into two separate embryos very early in the pregnancy. They are no more related than regular siblings! Image from Wikimedia Are there factors that increase your odds of having identical twins? Are there factors that increase your odds of having fraternal twins?

There are several things that can increase the odds of fraternal twins. Everyone has a chance of having twins. Below are a few that are especially relevant to this article: : Twins seem to run in my family. Does it have to do with our genetics? Is this true? Do scientists know why this is?

Does this increase our chances of having twins? References Hoekstra, Chantal et al. Steinman, G. Effect of diet and heredity on the human twinning rate. Other useful papers Machin, G. Shur, N. Search Ask a Geneticist. Privacy Policy Disclaimer Our Mission.

11 Surprising Facts About Fraternal Twins

The majority of twins are fraternal twins twins that look different from one another. Learn more about fraternal twinning, from how they form to how they relate to each other, as well as how they differ from identical twins. Zygotic refers to zygote, the egg fertilized by the sperm that will develop into an embryo and grow into a baby. Monozygotic twins come from a single egg and sperm that splits into two after conception. Because fraternal twins originate from separate conceptions, they can be boys, girls, or one of each.

Wondering if you might have two or more passengers aboard your mothership? Multiple births are, in fact, multiplying at a fantastic rate these days: The number of twin births has jumped more than 75 percent in the past 30 years; now, stats show that the there are about 33 twins born per every 1, births. The surge in older moms has a lot to do with it, along with an increase in fertility treatments and the rise in obesity, say experts.

In reality, the idea of having twins may not be so far-fetched. Birth of twins has increased some 78 percent since There are now around 34 sets of twins born per 1, births in the United States. There are some circumstances — whether naturally occurring or gained through fertility treatments — that may make you more likely to have twins. Already expecting twins?

Do genes influence whether someone has twins, either identical or fraternal?

Do I have to send my child back to school when they reopen or will I get fined? Plenty of women grow up dreaming about their future family, envisaging little mini-me daughters and bright-as-a-button boys. The Shettles Method vows to hold the secret to naturally selecting your unborn baby's gender, with many women swearing that it worked for them when it came to choosing whether they had a baby boy or girl. Well, many women swear that the following natural methods helped them to conceive twins, despite the fact that twins didn't run in their family. So, if you're hoping to have twins, try the below steps to help amp up your chances of having double the trouble! Aaaaaand if you're expecting twins fear not, because we've rounded up everything you're going to need to know if you're pregnant with twins. Yams are supposed to increase the fertility of a woman and improve the ovulation process as well, thereby increasing the chances of getting twins. Click here to get started. You love nothing more than helping your kids come up with original ideas for their school projects, and are content spending afternoons at home making things.

More on Gender Probability: Twins

There is no doubt that twinning seems to run in some families. Closer investigation reveals that this is mainly confined to nonidentical, or fraternal dizygotic - DZ twins, although there are a few rare families with extraordinary numbers of identical monozygotic - MZ twins. Furthermore, the increased chance of twinning seems to be entirely a property of the mother, not the father. Of course, there are counter examples to all these rules, and there are even families with large numbers of both identical and fraternal twins. At the moment it is not clear whether these just occur by chance and we get to hear about them due to reporting bias they always make great front page stories or whether they represent some new biological mechanism.

Just like in real life, pregnancy is a popular way for Sims to

There are many myths about how to improve the odds of having twins. Although there are no proven ways to increase the likelihood of conceiving twins, there are certain factors that can make this type of pregnancy more likely. Twins can occur either when two separate eggs become fertilized in the womb or when a single fertilized egg splits into two embryos. Having twins is more common now than it was in the past.

Do twins run in families?

In This happens when the fertilised egg 'loses' one of the copies of the Y chromosome when it is dividing into two embryos in very early development. The resulting babies are then male XY and female XO. The normal genetic make-up of a girl is XX.

Back to Pregnancy. It depends on the type of twins. There's no evidence that identical twins run in families. However, non-identical twins can run in families. A couple is more likely to have twins if there are twins in the woman's family.

Seeing Double: How to Increase Your Chances of Having Twins

People have an insatiable curiosity when it comes to how to have twins. I know this firsthand as a mom of 7-year-old twins. Apparently, people want to know what are the chances of having twins and even much to my surprise how to have twins. It just happened. However, I did talk to some of the leading experts on the topic of how to have twins and scoured the research to shed a little light on how and why twins happen. In this article: How do twins happen? How common are twins? What are the chances of having twins?

Jump to What improves your chances - Your odds of having twins go up with each pregnancy. This is likely because woman's ovaries start releasing.

What are my chances of having twins? My dad is a fraternal twin, and my aunt just got pregnant with fraternal twins. And that can be true! Compared with the general population, women with a mother or sister who have had twins are twice as likely to have twins themselves. Birth of twins has significantly increased over the past years, as you can see on the graph below.

How to Have Twins: the Myths and the Science

Battles between the sexes have been waged endlessly, but a study gave a definite edge to females. Researchers at the Helen Schneider Hospital for Women and the Sackler School of Medicine at Tel Aviv University in Israel concluded that outcomes for twin pregnancy are enhanced when at least one of the twins is a girl. The study evaluated more than 2, twin pregnancies and contrasted the outcomes for girl-girl, boy-girl, and boy-boy twins.

Math [ Privacy Policy ] [ Terms of Use ]. I am pregnant with twins--sex unknown. Since neither is older than the other, what is the probability of having any gender combination? My point is that bg and gb are the same combination, so his probability isn't correct.

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