Learning the Gender of Twins: Different Methods & Timing

As a parent, it can be exciting about learning the gender of twins. With two babies on the way, it’s natural to want to know if you will be expecting two boys or two girls. In recent years, several different methods and technologies have been available for learning the gender of twins early in pregnancy. In this article, we’ll explore the different methods and timing that can be used to determine if you are having two boys, two girls, or one of each!

When can you find out the gender of the twins?

The anticipation of learning the gender of twins can be a thrilling experience for many parents. When it comes to finding out the gender of twins, there are several options available.

For expectant parents who want to find out as soon as possible, ultrasound technology is commonly used. Ultrasound imaging can usually detect the genders of twins at around 18-20 weeks gestation, though this may vary depending on the position of the babies in the uterus during the scan. It is important to note that ultrasounds aren’t 100% accurate and sometimes an incorrect gender may be given if only one baby is visible in an ultrasound image.

Another option for parents wanting to know their twin’s gender is through blood tests such as amniocentesis or chorionic villus sampling (CVS).

Learning the Gender of Your Twins

Learning the gender of twins can be a thrilling experience. Although modern technology has made it easier than ever to discover the sex of your babies, there are still several techniques that can help parents-to-be learn the gender of their twins before delivery.


Ultrasound technology has made it possible to determine the sex of your babies with relative accuracy as early as 12 weeks into pregnancy.

Most ultrasounds performed between 18 and 22 weeks will give you an accurate picture of the gender of your twins. The ultrasound technician will usually be able to tell you which one is a boy and which one is a girl. However, if your ultrasound technician cannot make a definitive determination, they may suggest that you wait until after 24 weeks when both genders are more developed and easier to distinguish from each other on the screen. Check out Baby Hair On Ultrasound.

Blood Test (Non-Invasive Prenatal Testing):

Twins Blood Test (Non-Invasive Prenatal Testing) is a revolutionary method of prenatal testing. It is a testing procedure that can be done without having to insert any instruments into the womb and can be done as early as 10 weeks into pregnancy. This type of non-invasive prenatal test (NIPT) can detect chromosomal abnormalities and other genetic conditions in unborn twins, making it an invaluable tool for parents who are expecting twins.

The technique uses cell-free fetal DNA which circulates in the mother’s blood during pregnancy. By taking a simple blood sample from the mother, doctors can sequence and analyze the fetus’ DNA to determine whether there are any genetic abnormalities present in either twin.


Amniocentesis is a prenatal test that can be used to gather important information about a baby’s health before it is born. It can also determine the gender of twins, which has been a great benefit for pregnant mothers who are expecting more than one child.

This process involves taking a small sample of amniotic fluid from the mother’s uterus by inserting a thin needle through her abdomen and into the uterus. The sample is taken between weeks 14 and 20 of pregnancy, giving parents plenty of time to prepare for the arrival of their new bundles of joy — or surprises! Once the sample is taken, it’s tested in a lab and results are usually available within two weeks.

Chorionic Villus Sampling

One way to determine whether you are having two boys, two girls, or one of each is through Chorionic Villus Sampling (CVS). CVS tests cells that have been taken from the placenta and examines them in a laboratory setting. This procedure can accurately tell the gender of your twins at approximately 10 weeks into pregnancy. A small sample of tissue will be taken from your uterus and sent off to a lab for testing. Results usually take about 1-2 weeks to receive back from the lab after this procedure has been completed.

At-Home DIY Testing

At-home DIY testing provides curious parents with the most affordable way to learn the gender of their twins. It only requires a few simple materials and steps to accurately guess the genders without having to visit a doctor. The process usually consists of obtaining samples from both babies and then performing DNA tests on them using reliable kits that are available online. Results are often available within just a few days! Doing this is both cost-efficient and convenient for parents who want an answer right away.

Old Wives’ Tales

Old wives’ tales have been used for centuries to learn the gender of unborn babies and some families swear by them. Some popular methods include looking at the shape of your belly or studying how quickly you put on pregnancy weight—if you grow quickly, it could mean you carrying girls! Other popular tests include wedding rings over strings (girls make the ring move in circles), dangling a needle over your hand (girls go back and forth), or throwing wedding bands in a pot (boys move outwards; girls stay still).

  • Carrying Position: One of the most common methods pregnant women use is analyzing how they carry their twins. People say that if you carry your twins higher up and out front, then it’s more likely that you will have two girls; while carrying them low and spread apart indicates two boys.
  • Morning Sickness: If a woman experiences more severe morning sickness during her pregnancy, she is likely carrying two females. On the other hand, milder morning sickness is usually a sign that she will welcome two boys into the world. Though this test may give expecting mothers an idea of what to expect when their babies arrive, it is not always accurate since every woman’s experience with pregnancy differs.
  • The Ring Test: The Ring Test involves placing a single ring—either wedding or engagement—on a string or chain suspended over the pregnant woman’s belly. If the ring swings in a circular motion, it is believed that both babies will be of the same sex; if it swings back and forth like a pendulum, then it means two different sexes. However, this test is far from reliable since there are so many other variables that could cause the ring to swing one way or another: air currents from opening doors or windows, movement from people standing nearby, etc.
  • Baby’s Heartbeat: The first old wives tale is that if your baby’s heart rate is above 140 beats per minute (bpm), it means you are having a girl. If it is below 140 bpm then you are having a boy. While there is no scientific evidence to back this up, it has been believed by many for generations.
Learning the Gender of Twins

Who Determines the Gender of the Baby

The answer to this question lies in biology and genetics. During conception, when a sperm meets an egg, certain chromosomes are present that will determine whether the baby is male or female. The presence of two X chromosomes results in a female child while two Y chromosomes indicate that it’s a boy. In cases where there are different combinations of these sex chromosomes (XO or XXY), the outcome may not be as easy to identify at first glance.

How Early Can Gender Be Determined By Ultrasound

Ultrasound technology has become increasingly advanced in recent years and some doctors may now be able to determine the sex of twins as early as 11-14 weeks. However, because each twin is located closely together and their genders may not always be completely recognizable or distinguishable during an early ultrasound scan, there is still no guarantee that parents will find out both genders at this stage. To increase accuracy, doctors recommend waiting until later in pregnancy when it is easier to differentiate between the two babies.

Twin Gender Probabilities

To determine what type of twins you have, it’s important to first understand the probabilities associated with each gender combination. When it comes to twin gender probabilities, there are three primary possibilities: boy-boy, girl-girl, and boy-girl. The likelihood of having two boys or two girls at once is equal – 25% for both combinations. On the other hand, the chances of having a boy and a girl as twins are slightly higher at about 50%.

The probability of having twins can depend upon genetics and family history. Identical twins occur when a single egg is fertilized and then splits into two separate embryos, resulting in two genetically identical babies. This type of twin has an equal chance of being either gender because their genes are the same.

Fraternal twins happen when two eggs are fertilized at the same time by different sperm cells as they come from different embryos; these types of twins have a 50/50 chance of being male or female like any other siblings would have.

As science has advanced over recent decades, technology such as ultrasound can now help us determine the genders of babies in utero so that parents can be better prepared for their arrival! Check out Yams for Twins: Myth or Fact?

Should I Find Out the Gender of My Baby (Babies!)

For expectant parents, learning the gender of their baby (or babies) is one of the most exciting parts of pregnancy. It can also be one of the most difficult decisions as well. For couples expecting twins, should they find out the genders?

The answer to this question is ultimately up to each family and there are a few factors to consider when making this decision. One obvious factor is whether or not you have a preference for either boys or girls. Understandably, some parents may have specific ideas about what type of children they would like and it might be important for them to know ahead of time so that they can prepare accordingly.

If you are having twins, you may want to keep them both in similar clothes and accessories regardless of their gender – in which case knowing ahead could be helpful as well. Check out How Far Apart Are Twins Born?

Related Questions: Learning the Gender of Twins

Are Twins of the Same Gender More Common? 

Yes, twins of the same gender are more common than those of opposite genders. This is because fraternal (dizygotic) twins occur when two separate eggs are fertilized by two different sperm cells. When this happens, the chances that both eggs will be of the same gender are higher since they come from the same parent.

On the other hand, identical (monozygotic) twins occur when a single egg splits in two and develops into two embryos. Since this occurs randomly, it is equally likely for either gender to occur. Therefore, fraternal twins are more likely to be of the same gender than identical twins.

Overall, studies have shown that around 75% of twin pairs are of the same gender while 25% consist of one male and one female. Additionally, research has also found that having a family history of fraternal twinning increases your chances of having a set of twins with the same gender as well.

Can Twins Be Missed at 8 Weeks?

Yes, twins can be missed at 8 weeks. This is because the ultrasound technology used to detect multiple pregnancies is not always accurate at this stage. Most doctors will not diagnose a twin pregnancy until at least 12 weeks when the fetus has developed enough for two separate heartbeats to be detected.

At 8 weeks, one of the twins can be hidden behind the other or obscured by their shared placenta. Additionally, if one of the twins is smaller than average or has a slower heartbeat, they may go undetected during an ultrasound scan. It’s also common for one of the twins to be located in a different part of the uterus than expected, which could make them difficult to find on an ultrasound.

If you are concerned that you may have a twin pregnancy, it’s important to speak with your doctor and ask for additional tests such as a Doppler ultrasound or blood test that can help confirm your suspicions.


In conclusion, learning the gender of twins is an exciting and special experience. It is a wonderful way to bring families closer together and create lasting memories. With the right education and support, parents can be prepared for whatever gender of twins they may have. Understanding the unique nuances that come with having two children of the same sex can help parents anticipate issues or opportunities in the future. Celebrate this momentous occasion and take pride in having two amazing children, regardless of gender. Read Sleep Safety for Toddlers: When Blankets & Pillows Are Safe

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