It's National Twin Day! (2024)

It's National Twin Day! (2)

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Most people know someone who is a twin. Perhaps they are a family member or friend. Maybe they are a neighbor or an acquaintance from work or school. If they don't know any twins firsthand, they are bound to be familiar with famous or celebrity twins. National Twin Day was proclaimed "to celebrate all things twins," and is a day that "celebrates all the siblings who enjoy the unique connection because they share a birthday."

About two out of three twins are fraternal, or dizygotic, coming from two zygotes (fertilized eggs), and the other third are identical, or monozygotic, coming from one zygote. Fraternal twins develop when two eggs are released from a woman's ovaries and are fertilized by two sperm. The two fertilized eggs produce two children who are genetically unique. The appearance of the twins may be quite similar or may be different. During gestation, fraternal twins receive food and oxygen through separate placentas and umbilical cords.

Identical twins develop when one fertilized egg splits or divides in two within a few days of fertilization. Two babies with the same genetic information develop. They look almost identical, but there may be some differences in appearance due to different experiences in the womb and after birth. Unlike fraternal twins, identical twins are always the same sex.

There are three types of identical twins. About a third come from zygotes that split right after fertilization. These twins have separate placentas. Most of the other two-thirds of twins come from zygotes that split after attaching to the wall of the womb. These twins share placentas. A small number of zygotes split later than this. These twins not only share a placenta, but the inner sac called the amnion. Those sharing a placenta are more prone to complications, and those sharing amniotic fluid are even more prone. When they share a placenta they share a blood supply, which each twin might not receive equally. When they share an amnion, their umbilical cords may get wrapped together and cut off nutrients.

Factors increase the likelihood that a woman will have twins. She is more likely to have them if she is in her 30s or 40s because older women have higher levels of the sex hormone estrogen than younger women, which makes the chances higher that they will produce more than one egg at a time. The more previous pregnancies a woman has had, the higher odds that she will have twins. The odds also go up if a woman is a fraternal twin, has had fraternal twins, or has siblings who are fraternal twins. Race can play a factor: Blacks have twins at the highest rate, while Asians have them at the lowest. Assisted reproductive techniques may also play a role: ovaries may be stimulated, leading them to release more than one egg during ovulation.

How to Observe National Twin Day

Spend the day celebrating twins! Give a shout-out to friends or family members who are twins, or to some famous twins. If you happen to be a twin, share photos and memories, or host a twin party where you invite all the twins you know. Post about the day on social media with the hashtag #NationalTwinDay.

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It's National Twin Day! (2024)

FAQs

It's National Twin Day!? ›

On December 18th, National Twin Day

Twin Day
Twins Days is held annually on the first full weekend in August in Twinsburg, Ohio, United States to celebrate biological twins (and other multiples, e.g. triplets, quads).
https://en.wikipedia.org › wiki › Twins_Days
celebrates all the siblings who enjoy the unique connection because they share a birthday.

Why do we celebrate Twins Day? ›

National Twins Day celebrates the unique bond between twins. It began in Twinsburg, Ohio, and was named after identical twins Moses and Aaron Wilcox. They bought land in 1819 and later donated part of it to develop a town, insisting it be renamed Twinsburg.

What is twin day? ›

What day is National Twins Day celebrated? First weekend in August. What is National Twins Day? National Twins Day is a day to celebrate the special bond between twins, whether identical (monozygotic) or fraternal (dizygotic).

What day is Twin Day 2024? ›

August 2-4, 2024

Countdown until 2024 Twins Days!

When did Twins Day start? ›

The event has taken place every summer since 1976 when the festival was founded by a group of Twinsburg citizens, based on a concept developed by Ray Diersing, Sage Hiller, and Ari Hiller. The first time Twins Day was proposed to city council, it was rejected; city council thought it was a bad idea.

What day is National Twin Day? ›

On December 18th, National Twin Day celebrates all the siblings who enjoy the unique connection because they share a birthday.

What day do twins split? ›

Roughly two-thirds of identical twins from between 4 and 8 days after conception. Identical twins that likely split from days 9-13 after conception: These twins share one amniotic sac, one chorion and one placenta. Only 1-2% of all twins split this late in development.

Why is being a twin so special? ›

They share a primary attachment that is irreplaceable and forms a lifelong attachment and bond as well as an indelible identity. Sharing their in utero life is the beginning of their nonverbal communication and their need for closeness.

Are twins still twins if they are born a day apart? ›

Yes, they were conceived together and share the same womb so therefore they are twins. Twins are usually born just minutes apart, but can still be born on different days. For example if one is born at say 11:50pm and the other is born at 12:00am then they are born on different days. They are still twins though.

What are twins called if they are born on different days? ›

Two separate eggs (ova) are fertilised by two separate sperm, resulting in fraternal or 'dizygotic' (two-cell) twins. These babies will be no more alike than siblings born at separate times.

Does twins have the same birthday? ›

Twins make up about 3% of live births, according to the Centers for Disease Control and Prevention. And Yurkanin said the odds of twins being born on different days is a rare phenomenon.

What is a cute status for twins? ›

Because I have my twin, I have everything. No matter what you do in life, know I am right here beside you, twin. Even when distance separates us, we are never far from one another because we live in each other's hearts. We are two beautiful flowers that grew on the same stem.

How are identical twins the same? ›

Identical twins (also called monozygotic twins) result from the fertilization of a single egg by a single sperm, with the fertilized egg then splitting into two. Identical twins share the same genomes and are nearly always the same sex.

What date is Twins Day? ›

National Twins Day is celebrated every year on December 18th to honor the unique bond between twins. Twins are a fascinating subject, and there are many interesting facts and stories about them.

Who was the first born twin? ›

Who is the elder in twins? This should be pretty obvious, it's the twin born first. Although unless something goes very wrong with the delivery, the time is so close that there really isn't a elder or younger in twins.

What is twin day at school? ›

Every year the school has “twin day” where students find a classmate to be their twin and they dress alike. This is a cute idea in theory, and the easy solution for my kids is to dress like each other as they are both girls and close enough in age.

What is the meaning of Twinning day? ›

Twins are one of a kind and are meant to be celebrated. Their bond and connection are something to learn from every day. From having their own language to starting a bond right inside the mother's womb, twins are special for many reasons. On this day, twins are celebrated for being who they are.

Why is having twins special? ›

1. Knowing that you're only going to have to go through pregnancy and childbirth once to end up with two children. 2. Getting creative and enjoying the fun of choosing two baby names that fit together perfectly.

What is a fact of the day about twins? ›

They Can Sense Each Other's Emotions. Twins have a unique bond that allows them to sense each other's emotions and feelings. They can often feel each other's pain, joy, and sadness, even when they are not in the same room. This is called twin telepathy and is a subject of much fascination and research.

Why twins are so important? ›

If the identical twins are more similar, that indicates genes matter. For example, twin studies have shown that around 40% of individual differences in personality can be explained by genes, along with as much as 80–90% of differences in height and weight at the end of childhood.

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