Health Issues. Tips and Tools. Our Mission. Find a Pediatrician. Text Size. Page Content. The information contained on this Web site should not be used as a substitute for the medical care and advice of your pediatrician. There may be variations in treatment that your pediatrician may recommend based on individual facts and circumstances. Follow Us. Back to Top. Medical Home. Family Dynamics. Types of Families. If you have monoamniotic-monochorionic twins, your healthcare provider will monitor your pregnancy closely.
Multiple births — which include twins, triplets , quadruplets, and more — have become more common in recent years because more couples are turning to fertility drugs and IVF treatments to help them conceive.
In the United States, twins account for about 3 percent of live births. Getting pregnant over the age of 30, being a twin yourself, or having a family history of twins on the maternal side can also increase your chance of having twins.
Although the biology behind twins can be tricky to completely understand, just know that having multiple babies is a miracle of nature. Download the Pampers Club app , and receive rewards like coupons, cash back, and gifts for all your Pampers purchases. Fraternal Twins Dizygotic Fraternal twins, which are also called dizygotic twins, are the result of two separate eggs being fertilized by two separate sperm. Review this article: 0.
Start with: Your email address. Sign up NOW. A conjoined twin pregnancy is high-risk, but breakthroughs in surgery have been able to improve outcomes. Surgery can even allow conjoined twins to live independently. Although a small study found that just 7. Sometimes, as twins develop in utero, one twin becomes larger and more dominant.
The other twin stops developing and begins to depend on their sibling. Known as parasitic twins , these twins are physically conjoined. This is because the smaller twin is usually missing vital organs or a fully developed brain or heart.
In fact, you might not even recognize the smaller twin as a separate individual. A milder version of this is called twin to twin transfusion syndrome TTTS. Acardiac twins experience a more extreme form of TTTS that may result in developmental issues for the fetuses. Treatments like surgery can improve outcomes, according to research. In semi-identical twins, two separate sperm fertilize one egg.
The fertilized egg then splits in two. So, semi-identical twins share all the same chromosomes from their birthing parent, but only about 50 percent from their non-birthing parent. Sometimes identical twins can be assigned the sex of male and female at birth. These twins start off as identical males with XY sex chromosomes. But shortly after the egg divides, a genetic mutation called Turner syndrome occurs, leaving one twin with the chromosomes X0.
This twin will be assigned female at birth but may have developmental issues, as well as difficulties with fertility later in life, according to the National Health Service.
Once a person becomes pregnant, their body stops releasing new eggs for potential fertilization — except in some rare cases. A phenomenon known as superfetation can occur when a second egg gets released and fertilized after a person is already pregnant.
In this case, both fertilized eggs will develop, but one twin will be slightly older than the other. This is known as heteropaternal superfecundation — a common occurrence in animals but very rare in people. Twin pregnancies often come with an increased risk of developing some medical conditions. These can include:. A twin pregnancy has risks of complications, so parents should make sure to receive good prenatal care and seek medical attention for any concerns.
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