This means that the triplets would be genetically identical. Triplets could also occur if one of two zygotes divide in half. This would mean that two of the triplets would be genetically identical while the third child is considered a fraternal multiple. Similar scenarios occur in quadruplets and other forms of multiples. How Do Multiple Births Occur? Which category do higher-order multiples triplets, quadruplets, etc.
Can I get pregnant if…? Share this post:. Share on facebook Facebook. Share on twitter Twitter. Share on linkedin LinkedIn. Share on email Email. When two separate eggs are fertilized by two separate sperm, the babies are called fraternal twins. Singletons, or one baby, are the most common type of pregnancy. However, more people are getting pregnant with multiples now than in the past. This is mostly because more people are having babies later in life, and multiples are more common among parents who are older than Also, more people are using fertility treatments to get pregnant.
Multiples are also more common among people who use fertility treatment. Ultrasound uses sound waves and a computer screen to show a picture of a baby. You may need to go to extra prenatal care checkups so your provider can watch you and your babies for problems. You also may need more prenatal tests such as ultrasounds to check on your growing babies throughout your pregnancy. This is a doctor who specializes in high-risk pregnancies.
It just means they can check you and your babies more closely to help prevent or treat any conditions that may happen. Vaginal birth is the way most babies are born. During vaginal birth, the uterus contracts to help push the baby out.
During a c-section, the doctor makes a cut in the belly and uterus to remove the baby. Most triplets and higher-order multiples are born by c-section. You may be able to have a vaginal birth if:. But you do need more of certain nutrients, such as folic acid , protein, iron and calcium. You can get the right amount of these nutrients by eating healthy foods and taking your prenatal vitamin every day.
Prenatal vitamins are multivitamins made just for pregnant people. Compared to a regular multivitamin, they have more of some nutrients that you need during pregnancy. Your provider can prescribe a prenatal vitamin for you at your first prenatal care checkup. The amount of weight to gain depends on your weight before pregnancy and how many babies you have.
Talk with your provider about how much weight to gain. Talk with your provider about what kind of activities are safe for you to do. You may need to cut out any high-impact activities, such as aerobics or jogging, that make you jump or put stress on your joints. You may be able to do some activities, such as swimming, prenatal yoga or walking.
Later in pregnancy, you may need to limit physical activity, including travel and work. Many people who are pregnant with multiples go on bed rest. Bed rest may mean staying in bed all day or just resting a few times each day. Get expert tips and resources from March of Dimes and CDC to increase your chance of having a healthy, fully-term pregnancy and baby. Sign up for our emails to receive great health information and join us in the fight for the health of moms and babies.
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Ambassadors Ambassadors Celebrity Advocate Council. Mission stories Spotlights Impact Stories. Being pregnant with twins, triplets and other multiples. E-mail to a friend Please fill in all fields. Please enter a valid e-mail address. Triplets are three babies carried in the same womb during a single pregnancy.
Like twins, triplets and other higher-order multiples can be categorized by their zygosity or degree of genetic similarity. Though triplets are most commonly fraternal dizygotic or trizygotic , it is possible for triplets to be identical monozygotic. While many people are familiar with the terms "identical" and "fraternal" in describing multiples and use them to describe whether twins or triplets look similar, what these terms actually refer to is how the multiples formed in utero.
Monozygotic or identical multiples form from the same egg. In the case of identical twins, the fertilized egg splits in two.
In the case of identical triplets, the egg may split just once into three or it may split twice where the egg splits first in two and then one of the two splits again , resulting in three embryos with the same general DNA characteristics. Monozygotic triplets are always the same sex, either all boys or all girls. Some monozygotic triplets are actually quadruplets where one embryo has vanished or been reabsorbed.
Research on the prevalence of monozygotic triplets varies. A case report of a healthy set of spontaneously conceived three identical triplet boys lists the incidence at 1 in , live births. Most reported cases are conceived through assisted reproductive techniques. That paper noted that only seven other cases of spontaneously conceived identical triplets were known.
A paper states the rate of incidence of identical triplets is times more frequent with assisted reproductive techniques than spontaneous conception but is still extremely rare. A monozygotic triplet pregnancy carries the risks of a monozygotic pregnancy with a shared placenta, plus the additional risks of a triplet pregnancy.
A pregnancy of this type could be more likely to encounter problems such as preeclampsia , preterm labor , or transfusion syndrome. Most triplets are trizygotic, meaning that each individual formed from a separate zygote , or egg and sperm combination.
They are commonly described as "fraternal" multiples and share the same genetic similarities as any siblings. However, it is not uncommon for triplets to be dizygotic, which occurs when two separate eggs are each fertilized, and one of the fertilized eggs then splits into two. Essentially, two of the triplets are monozygotic identical twins, sharing the same general DNA characteristics, while the third triplet having been conceived with a different egg and sperm has a unique genetic makeup from the other two.
According to a guide by the American Society for Reproductive Medicine ASRM , multiple pregnancy is "more common in women who utilize fertility medications to undergo ovulation induction or superovulation. Superovulation may be part of assisted reproductive technology treatments like in vitro fertilization IVF. It means that multiple eggs are released through the use of fertility drugs, rather than a single egg that would usually be ovulated in the course of a menstrual cycle.
While multiple pregnancy is more common with medically assisted reproduction, twins, triplets, and higher-order multiples are still possible with naturally conceived pregnancies as well.
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