How Can You Get Pregnant With Twins?

Twins happen when two eggs are released and fertilized, or when one fertilized egg splits into two. The clearest answer to how you can get pregnant with twins is this: your chances depend mostly on factors you cannot control, like your age, your family history, and your genetic makeup. Fertility treatments raise the odds significantly, but natural twin pregnancies follow their own biology.

What Actually Causes Twins?

There are two types of twins, and they happen for completely different reasons. Fraternal twins occur when a woman releases two eggs in the same cycle and both are fertilized. Identical twins occur when one fertilized egg splits into two embryos. That split has no known cause and happens randomly.

Fraternal twins are the type influenced by outside factors. Releasing two eggs in one cycle is called hyperovulation. Some women do this naturally. Others never do. Identical twins occur at roughly the same rate across all populations — about 3 to 4 per 1,000 births — regardless of age, race, or fertility treatment.

Most of what people say about “increasing your chances” of twins actually refers to fraternal twins. Identical twins cannot be planned or influenced by anything you do.

What Factors Raise Your Odds Naturally?

Several well-documented factors increase the likelihood of releasing two eggs in one cycle. These are the factors that genuinely matter.

Age matters. Women in their late 30s have higher rates of twin births than younger women. This is because hormone levels shift as you approach menopause, and the body sometimes responds by releasing more than one egg in a cycle. The highest natural twinning rates occur between ages 35 and 40.

Family history matters on the mother’s side. If your mother or maternal grandmother had fraternal twins, you are more likely to as well. This genetic tendency affects how many eggs you release, not your partner’s side. A man’s family history of twins does not affect his partner’s chances of conceiving twins.

Race and ethnicity play a role. Women of Nigerian descent have the highest natural twinning rates in the world. Women of East Asian descent have among the lowest. Women of European descent fall in between.

Height and weight show a measurable association. Research has found that taller women and women with a higher body mass index are slightly more likely to have fraternal twins. The exact mechanism is not fully understood, but it may relate to nutrition and hormone levels. These effects are modest and not something you can meaningfully control.

Previous twin pregnancies matter. If you have already had fraternal twins, your chance of having them again is higher. This reflects your underlying tendency to hyperovulate.

Can Diet or Supplements Increase Your Chances?

Some claims about diet and twins circulate widely online. The evidence behind them is thin.

The most common claim involves yams or cassava. One region in Nigeria has very high twinning rates, and some researchers have suggested that a substance in wild yams may stimulate the ovaries. This connection has never been proven in controlled studies. Eating yams has not been shown to increase twin conception.

Folic acid is sometimes mentioned in connection with twins. Some research has suggested that women taking folic acid supplements before conception had slightly higher rates of twin births. Other studies have not confirmed this finding. The evidence is mixed and the effect, if it exists, is small. Folic acid remains essential for preventing neural tube defects regardless of any effect on twins — but it should not be taken in higher doses hoping for twins.

No food, herb, or supplement has been proven to increase your chance of conceiving twins. Anyone claiming otherwise is selling something without scientific support.

Does Fertility Treatment Increase Twin Rates?

Yes — and this is the most effective way to increase your odds, though it comes with real risks.

Clomiphene citrate (Clomid) and letrozole (Femara) are oral medications that stimulate the ovaries to release eggs. Both medications carry a twin rate of roughly 5 to 12 percent. The exact rate varies by study and by patient.

Gonadotropins are injectable fertility hormones. These carry a much higher twin rate — some studies report 20 to 30 percent. Because these drugs stimulate the ovaries more aggressively, they also carry a higher risk of releasing multiple eggs at once, which can lead to triplets or more.

In vitro fertilization (IVF) offers the most control. The twin rate depends entirely on how many embryos are transferred. Transfer one embryo and the twin rate is low — roughly 1 to 2 percent, because a single embryo can still split into identical twins. Transfer two embryos and the twin rate rises substantially, often to 20 to 30 percent or higher depending on the clinic and the embryos.

Most fertility specialists now recommend transferring a single embryo whenever possible. Twin pregnancies carry higher risks for both mother and babies, including preterm birth, low birth weight, and pregnancy complications. The goal of modern fertility care is a single healthy baby, not twins.

What Are the Risks of Twin Pregnancy?

Twin pregnancies are not simply “two for the price of one.” They carry genuine medical risks that you should understand before pursuing twins.

Preterm birth is the biggest risk. The average twin pregnancy ends around 36 weeks, compared to 39 to 40 weeks for a singleton. Babies born before 37 weeks are considered preterm and may need time in the neonatal intensive care unit. The earlier the birth, the higher the risk of breathing problems, feeding difficulties, and long-term developmental issues.

Low birth weight is common. Twins are often born weighing less than 5 pounds, 8 ounces — the threshold for low birth weight. This is partly because they share space and nutrients in the womb.

Maternal risks increase. Women carrying twins have higher rates of gestational diabetes, preeclampsia, and pregnancy-related high blood pressure. These conditions require close monitoring and can affect delivery timing.

Cesarean delivery is more likely. Many twin pregnancies require a C-section, especially if the first baby is not head-down. Even when a vaginal delivery is possible, the labor and delivery process is more complex with two babies.

These risks are why many doctors approach twin pregnancies with extra caution. If you are considering fertility treatment, ask your doctor about the clinic’s policy on single embryo transfer.

Can You Choose the Gender of Twins?

No method has been proven to influence the sex of your babies, whether you conceive twins or not. The sex of each baby is determined by the sperm that fertilizes each egg. Sperm carries either an X or a Y chromosome. There is no diet, timing method, or position that has been shown to reliably influence this.

Some online sources claim that certain sexual positions or timing of intercourse relative to ovulation can sway the odds. These claims have no scientific support. If you are pursuing fertility treatment with IVF, preimplantation genetic testing can identify embryo sex before transfer — but this is only used for medical reasons in most countries, and it does not increase your chance of twins.

What About the “Twin Gene” — Does It Skip Generations?

The idea that twins skip a generation is a myth with a kernel of truth behind it.

The genetic tendency for fraternal twins is passed down through the mother. A woman inherits the tendency to hyperovulate from her mother. So if your maternal grandmother had fraternal twins, your mother is more likely to carry the trait, and you may inherit it too.

The “skipping” appearance happens because the trait only shows up in women. A man can inherit the hyperovulation gene and pass it to his daughters — but he cannot have twins himself. So a set of twins in one generation may not appear in the next, then reappears when a daughter inherits the trait. It is not actually skipping. It is just that the trait only expresses itself in female offspring.

A man’s family history of twins does not affect his partner’s chance of conceiving twins. What matters is the woman’s genetics, because her body decides how many eggs to release.

What Is the Most Honest Answer?

If you want to get pregnant with twins, the most honest answer is that you have limited control over the outcome. Age, genetics, and race are the dominant natural factors. Fertility treatment is the only reliable way to raise your odds — and it carries risks you should weigh carefully.

If you are simply hoping for twins and not pursuing fertility treatment, the best approach is to focus on overall health and let biology do what it does. There is no proven natural method to increase your chances. Anyone who tells you otherwise is not backed by evidence.

If you are considering fertility treatment, have an open conversation with your doctor about your goals and the risks. Many clinics now actively work to reduce twin rates because of the known complications. Your doctor can help you understand what is realistic for your specific situation.