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whattoexpect.com - What Are Your Chances of Having Twins? - What to Expect

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Wondering if you might have two or more passengers aboard your mothership? Multiple births have definitely multiplied in the past two generations. The number of twin births jumped about 75 percent from 1986 to 2009, and currently there are about 32 twins born per every 1,000 births. What’s behind this multiple-baby boom? 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. Yet these are only a few of the factors behind twin births. With these incredible stats in mind, it’s not such a stretch to wonder if you might conceive more babies than you bargained for. Here are the overall odds of having twins, along with factors that could increase your chances.

What are the chances of having twins?

Just over 3 percent of babies in the United States are now born in sets of two, three or more, with the majority — about 97 percent — of these multiple births being twins. So your chance of having twins is about 3 in 100.

What increases your chances of having twins?

A number of factors are at play when it comes to your chances of having twins, specifically fraternal twins. (Note that identical twins are rare and occur at random, so they're even more of an exciting surprise!)

Your chances of seeing double (or more) go up if:

You have twins in your family

Heredity doubles your chances of conceiving twins — but only on the mom's side. Even if your partner's family tree is loaded with dynamic duos, that won't increase your own odds of conceiving twins.

You've had twins before

Lightning can and does strike twice! If you've already given birth to a set of twins, look out — you're significantly more likely to do so again.

You're an older mom-to-be

You've been pregnant before

With each pregnancy, the odds that you'll have twins go up a little, likely because with each pregnancy you’re a little bit older (which in itself ups the chances of having twins).

You're undergoing (or underwent) fertility treatments

Although fertility treatments don’t come with as high a multiples rate as they used to, having any kind of assisted reproduction (especially the kind that stimulates ovulation) ups the chances of a multiple pregnancy. About one-third of twin births and three-fourths of triplet, quadruplet and other higher-order multiple births can be attributed to fertility treatments, according to a 2013 study in The New England Journal of Medicine, though the numbers are coming down because of improved fertility treatment protocols.

You're overweight

Women with pre-pregnancy BMIs higher than 30 are significantly more likely to have fraternal twins than women with lower BMIs.

You're Black

Black women are slightly more likely than white women to have twins. If you're Asian or Hispanic, however, you're a bit less likely than Black and white women to have twins.

Are my chances of having twins higher if I have multiple factors that up my odds?

It's true! If you can check more than one of the above boxes, your chances of twins increase even more, ever so slightly.

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webmd.com - Do Twins Run in Families? What to Know About the Heredity of Twins

Twins are fascinating and are the subject of many old-wives-tales. If you have a set of twins in your family, a relative may have told you that you have a higher chance of having twins — but do twins really run in families? As it turns out, some types of twins are hereditary. Suppose you're a gestational parent and a close relative (like a parent or sibling) has fraternal (non-identical) twins. In that case, you're twice as likely to have twins yourself. Read on to learn what you need to know about the heredity of having twins. What Causes Twins? There are two basic types of twins — fraternal (or dizygotic) and identical (or monozygotic) twins. Fraternal Twins Fraternal twins come from two separate eggs that two different sperm fertilize. Fraternal twins have separate amniotic sacs and placentas. Fraternal twins are the most common type of twin. Fraternal twins account for 70% of all spontaneous twin pregnancies. Fraternal twins can have different sexes and appearances and are no more genetically related than any other siblings with the same parents.

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