Is twins genetic or hereditary?

Are twins hereditary? Yes, some types of twins are hereditary, meaning that twins run in families. Heredity on the mother's side ups a couple's odds of conceiving fraternal twins. Fraternal twins are two babies from two different eggs that were released from the ovaries simultaneously.

whattoexpect.com - Do Twins Really Run in Families? - What to Expect

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If you or your partner comes from a family that's brimming with twins, you may be wondering whether that might influence your chance of having twins or multiples. The answer: It does — but only in certain cases. Here's what you need to know about the science behind family heredity and twins.

Are twins hereditary?

Yes, some types of twins are hereditary, meaning that twins run in families. Heredity on the mother's side ups a couple's odds of conceiving fraternal twins. Fraternal twins are two babies from two different eggs that were released from the ovaries simultaneously. Some research has found that having fraternal twins in a mother's immediate family may double the chances of conceiving fraternal twins. One theory is that it's because a certain gene may predispose some women to "hyperovulation," or releasing more than one egg during each menstrual cycle. Women with this gene appear to have naturally higher levels of particular hormones, including those related to the regulation of releasing eggs. 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. This is true even if his family is packed with multiples. What about identical twins, or two babies who have an identical set of genes because they're from one fertilized embryo that splits in two? Most cases of identical twins don't appear to run in families and instead seem to be a spontaneous occurrence, say experts. But there are some families with a larger-than-usual number of identical twins, suggesting there may be a genetic link. But such a link hasn't been proven definitively. In other words, there's no hard evidence that being from a family with identical twins has an impact on your probability of having identical twins yourself.

Do twins skip a generation?

If you've heard that twins skip a generation, the theory goes like this: If there is a hyperovulation gene and a man inherits it from his mother, he may pass this gene on to his daughter. His daughter, in turn, is then more likely to release more than one egg when she ovulates and therefore could conceive fraternal twins. So the twins could have, in essence, skipped a generation. However, because there aren't any definitive links between genes and hyperovulation and because twins don't predictably always skip a generation, it's likely just a coincidence when it does occur. In reality, there is no solid evidence that twins skip a generation. So that notion is nothing more than a colorful myth.

How likely is it that you'll have twins?

About 3.2 percent of all live births in the U.S. in 2019 were to twins. So there's about a 3.2 percent chance that you'll conceive twins. But a few factors — not just heredity — can up the chances of having twins, including the following characteristics in the mother:

She is 35 or older

She is overweight

She's taking fertility treatments

She's Black

This is not her first pregnancy, especially if she's previously been pregnant with multiples So take a good look at your family tree. If it's full of identical twins, or there are twins on the father's side but not the mother's, twins may not be in your future. But if there are fraternal twins on the mother's side, you may want to start stocking up on two of everything on your baby registry.

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What do you call babies born 17 months apart?

Irish twins is a slang expression for siblings born less than a year apart from each other.

dictionary.com - Irish twins Meaning & Origin | Slang by Dictionary.com

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Irish twins can name actual twins … who are Irish. As a slang term, however, Irish twins dates back to at least the 1850s. Early instances appears in American newspapers, suggesting the term coincides with the rise of Irish immigration to the US during the Great Famine—and xenophobic attitudes toward the newly arrived immigrants. The expression comes from the stereotype that Irish families have a lot of children and have them close together. One writer in the 19th-century even called Irish women “excellent brood wives.” The stereotype may well be Protestant in origin, as Irish twins are also called Catholic twins—the Irish traditionally being Catholic and birth control historically forbidden. Since the 19th century, Irish twins has gone on to describe any siblings, whether they are Irish or not, born less than a year apart, give or take. In 2008, Shiloh and Rider King Strong directed and starred in a short film called “Irish Twins” in which they play Irish twins and take their father’s ashes to Ireland.

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