The #1 Resource & Support Network for Parents of Twins

The #1 Resource & Support Network for Parents of Twins

What Are The Odds of Having Twins?

What Are The Odds of Having Twins?

What are the odds of having twins?

The odds of having twins can vary widely depending on a number of factors, but let’s be honest—sometimes it just feels like the universe has its own sense of humor. Here are the chances and some factors that might make you laugh (or cry, depending on how much sleep you’ve had).

Overall Odds:

In the United States, the percentage of pregnancies that result in twins has been increasing over the past few decades. As of 2022, approximately 3.1% of all live births in the U.S. are twins, according to the CDC. This means that out of every 100 pregnancies, about 3 result in the birth of twins. So, basically, the same odds as finding a pair of matching socks on laundry day!

This increase can be attributed to several factors, including the rise in maternal age (older women are more likely to have twins), the use of fertility treatments, and improved reproductive technologies.

twin pregnancy

Factors Influencing the Likelihood of Twins


If twins run in your family, congratulations! You might be next in line to join the “Double Trouble” club. Don’t worry; you’ll have plenty of help from Aunt Susan, who still hasn’t quite recovered from raising your twin cousins. A family history of fraternal twins, especially on the mother’s side, significantly increases the chances. If a woman’s mother or maternal grandmother had fraternal twins, she is more likely to have them as well.

Maternal Age:

Women over the age of 30, and particularly those between 35 and 40, are more likely to conceive fraternal twins. This is due to hormonal changes that can cause the release of more than one egg during ovulation. That’s right, the universe’s way of saying, “Happy 35th birthday! How about two babies instead of one?”

delivery day bootcamp

Number of Previous Pregnancies:

More pregnancies increase the chances of twins. It’s like the universe’s frequent flyer program: the more you fly, the more bonuses you get. In this case, the bonus is double diaper duty.


African women have the highest rate of twinning, Asian women have the lowest, and Caucasian women are somewhere in the middle. It’s almost like a global lottery, but the prize is two for the price of one!

newborn twins

Body Type:

Some studies suggest that taller women and those with a higher body mass index (BMI) may have a higher chance of having twins. Nothing like a little extra space for those twinnies to roam about for 9 months!

Fertility Treatments:

Fertility treatments increase the likelihood of twins. This is because these treatments often stimulate the ovaries to release multiple eggs. Because if you’re already going through the effort of fertility treatments, the universe might as well give you an extra baby. Thanks, universe!

Types of Twins

Identical Twins:

The chance of having identical twins is approximately 1 in 250 pregnancies or about 0.4%. The odds of having identical twins are less common than having fraternal twins, and these miraculous doppelgängers don’t run in families—they just pop up randomly, like the universe’s version of a surprise party. If you come across a family with more than one set of identical twins, they might attribute their twin-filled life to pure luck and coincidence rather than some mysterious genetic magic.

on demand twins class

Have you taken your expecting twins class yet? We offer a great class on demand so you can take it on your own schedule! There are so many video modules covering everything from your twins’ baby registry to your first week at home with twins! Sign up today to get started before your twins arrive.

Fraternal Twins:

The chance of having fraternal twins is about 1.2%, or 1 in 85 pregnancies. This can be higher if you have certain characteristics or use fertility treatments. So, if you find yourself in the lucky position of expecting twins, get ready for twice the giggles, twice the diapers, and twice the love! And remember, no matter how you get there, twins are a double blessing in disguise.

May The Odds Ever Be in Your Favor…

While the baseline chance of having twins is about 3%, this likelihood can increase significantly with factors like maternal age, genetic predisposition, and fertility treatments. So, if you’re feeling lucky (or just really love surprises), you might just hit the twin jackpot. And remember, whether you end up with one baby or two, you’re in for the adventure of a lifetime – Twiniversity is always here for you! Good luck, and may the odds be ever in your favor!


Hannah Gonsalves is a digital media specialist at Twiniversity. A proud mom of 4-year-old rowdy fraternal twin cowboys. Married to her high school sweetheart for 8 years, living on a ranch in rural Montana. Becoming a mom of multiples inspired her to pursue a career helping other twin moms. Before having twins, Hannah owned a catering and event planning company where she was responsible for coordinating events of all occasions. In their free time, they can be found at the Rodeo or in the mountains!

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