Medically reviewed by Valinda Riggins Nwadike, MD, MPH — written by Claire Sissons top top February 14, 2019

There are many myths around how to enhance the odds of having actually twins. Return there are no proven methods to rise the likelihood that conceiving twins, over there are certain factors that deserve to make this kind of pregnancy an ext likely.

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Twins can take place either once two separate eggs become fertilized in the womb or once a solitary fertilized egg splits right into two embryos.

Having pair is much more common now than it was in the past. According to the Centers for disease Control and Prevention (CDC), twin births have virtually doubled over the critical 40 years.

A woman has actually a higher chance of having twins if she conceives through the help of fertility therapy or is age 35 year or over. In the joined States, fertility treatments account for more than one-third of twin pregnancies.

In this article, we explore why twin pregnancies occur, how typical they are, and also factors that deserve to make them an ext likely. We additionally explain whether a person have the right to increase their chance of having twins.

Share on PinterestA woman might be more likely to have actually twins, depending on age, family members history, and fertility treatments.
Doctors carry out not fully understand the reasons why twin pregnancies sometimes occur. However, some determinants can rise the likelihood of providing birth to twins, including:

the woman’s agehaving a family history of twinshaving fertility treatments

Conception happens once a sperm fertilizes one egg to form an embryo. However, if there room two eggs current in the womb at the time of fertilization or the fertilized egg splits right into two different embryos, a woman can become pregnant through twins.

There room two species of twin:

Identical twins: This form of pregnant happens as soon as a fertilized egg splits into two separate embryos. These embryos space monozygotic, which method that they have identical genes. Similar twins space the very same sex as each other and also look really alike.Nonidentical, or fraternal, twins: This kind of pregnancy occurs when there room two eggs current in the womb at the moment of fertilization, and also sperm fertilize both that them. This embryos room dizygotic, which method that they execute not have identical genes and may no be the exact same sex.

Fraternal pair are typical after fertility treatment because healthcare experts often location two fertilized embryos into a woman’s womb to boost the opportunities of a effective pregnancy.

Twins are reasonably uncommon. Follow to the American culture for Reproductive medication (ASRM), only roughly one in 250 pregnancies outcomes in twins.

However, the birth of twins has actually increased substantially alongside the increase in the usage of fertility treatments and with more women choosing to have kids at a later age. Due to the fact that 1980, the birth price of twins has increased by much more than 75 percent.

A woman is an ext likely to have actually fraternal pair than similar twins. The same twins account for only around one-third of multiple pregnancies.

Several factors can boost the likelihood the a mrs conceiving twins. This include:

Family history

A woman has actually a slightly greater chance of having twins if she has a family history of twins. A family background of pair on the mummy side increases this likelihood much more than a family history on the father’s side. However, this only applies if conception takes location without the usage of fertility treatments.

According to the ASRM, females who are themselves nonidentical twins develop twins in around 1 in every 60 births. For males who are nonidentical twins, the opportunity of conceiving twins is just 1 in every 125 births.

Some people think that twins can skip a generation, definition that a person will potentially have actually twins if one of their grandparents did. However, over there is tiny evidence to assistance this theory.

Fertility treatment

The ASRM note that the main element that rises the possibility of having twins is the use of fertility treatments. The various types of fertility treatment obtainable increase the likelihood of twins in various ways.

Some fertility drugs occupational by stimulating a woman’s ovaries, which can sometimes reason them come release much more than one egg. If sperm fertilizes both of this eggs, this can result in twins.

In vitro fertilization (IVF) can additionally increase the chance of conceiving twins.

Healthcare professionals bring out IVF by extracting a woman’s eggs and fertilizing them v a donor’s sperm in a activities to produce an embryo. They then carry the fertilized embryo right into the woman’s womb.

To increase the likelihood the success, the healthcare skilled may place more than one embryo right into the womb. Twins can occur if both embryos implant and develop successfully.

Multiple pregnancies carry additional risks, therefore the healthcare professional will normally limit the variety of embryos the they deliver to the woman’s womb to minimize the possibility of a pregnancy with twins, triplets, or more.


According come the Office top top Women’s Health, ladies who are aged 30 year or older are much more likely to develop twins. The factor for this is that females of this period are an ext likely than younger ladies to release an ext than one egg throughout their reproductive cycle. If sperm fertilizes two different eggs, a twin pregnancy have the right to occur.

Height and also weight

The ASRM report the nonidentical twins space slightly an ext common in taller or heavier ladies than they room in small women. The factors for this are not clear, but it might be early to much better nutrition. Women v a greater body weight might have more resources easily accessible for a occurring fetus.

Racial background

In the U.S., Hispanic females are less likely to have actually twins than non-Hispanic white ladies or black color women, follow to the ASRM.

There are plenty of unproven claims around how to rise the likelihood that conceiving twins. Some civilization advise following details diets or using specific alternative therapies, but there is no scientific evidence to support these methods.

Fertility treatments, particularly IVF and also ovary stimulants, do boost the chances of having actually twins. However, a twin pregnancy is riskier for both the woman and also the occurring fetuses. Because that this reason, some fertility clinics advise against implanting lot of embryos during IVF treatment.

The CDC recommend the younger women that are having actually their first fertility treatment choose just one embryo for move to your womb.

As the success of fertility treatment is improving, over there is often less have to transfer more than one embryo. In the U.S., the number of IVF treatments entailing the transport of 3 or four embryos diminished significantly between 2007 and 2016. Transferring simply one or 2 embryos reduces the likelihood of a many pregnancy.

A twin pregnancy increases the danger of:

premature birthlow birth weightstillbirthcesarean deliveryneeding bed rest while pregnant

Although particular factors boost the opportunity of having actually twins, over there is no means to enhance the odds of having actually twins naturally. A woman will certainly usually discover out the she is pregnant v twins from an ultrasound early in the pregnancy.

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Some symptom may indicate a pair pregnancy, including much more intense morning sickness and very rapid load gain. Consistent medical appointments will enhance the chances of a healthy pregnancy.


Medically the review by Valinda Riggins Nwadike, MD, MPH — created by Claire Sissons top top February 14, 2019