White people assigned female at birth have the highest rate of higher-order multiple births (triplets or more). This is especially true for those older than 35.
Heredity – a woman is more likely to conceive fraternal twins if she is a fraternal twin, has already had fraternal twins, or has siblings who are fraternal twins. Race – Black African women have the highest incidence of twins, while Asian women have the lowest.
Risk Factors for Multiple Pregnancy. Naturally, twins occur in about one in 250 pregnancies, triplets in about one in 10,000 pregnancies, and quadruplets in about one in 700,000 pregnancies.
This is mostly because more people are having babies later in life, and multiples are more common among parents who are older than 30. Also, more people are using fertility treatments to get pregnant. Multiples are also more common among people who use fertility treatment.
In Australia, twins happen in 1 in every 80 births. This means that 1 in 40 Australians is a twin. The birth rate of identical twins is the same around the world and doesn't vary with the mother's age.
Vietnam was the country with the fewest twins (6.2 per 1,000 births) and Benin was the country with the most (27.9 per 1,000). Over time, some of these developing countries saw increases in twins, but some saw decreases and some stayed the same, with any changes tending to be small.
There are two main ways that a multiple pregnancy can happen: One fertilized egg (ovum) splits before it implants in the uterine lining. Two or more separate eggs are fertilized by different sperm at the same time.
Most babies born at once
In 2021 a Malian woman named Halima Cissé gave birth to nonuplets — nine babies delivered from one pregnancy.
Multiple pregnancies make up about 1.5 per cent of births in Australia, with about 4300 sets of twins and just over 80 sets of triplets and higher order multiples born each year. Multiple pregnancies are usually recognised by the end of the first trimester due to the widespread use of ultrasound.
So assuming the triplets are fraternal, the chances are 25 percent that they will be either all boys (12.5 percent) or all girls (12.5 percent). And the chances that they will be two of one sex and one of the other are 75 percent. (Two boys and one girl = 37.5 percent; two girls and one boy = 37.5 percent.)
According to our Medical Birth Survey, the average gestation for families who contact Raising Multiples is approximately: 35.5 weeks for twins. 33.1 weeks for triplets. 31.3 weeks for quadruplets.
Multiple births (delivering twins, triplets or more) is common with fertility treatments. But the couple conceived naturally. Spontaneous triplets are rare, occurring in 1 in almost 7,000 pregnancies. Other data puts the chances even lower, with naturally occurring triplets occurring in 1 in 10,000 pregnancies.
Women can reproduce for about half of their lifetime and can only give birth about once every year or so. So it makes sense that women can only have a fraction as many children as men. One study estimated a woman can have around 15 pregnancies in a lifetime.
Superfetation is a phenomenon that occurs when a pregnant woman releases an egg, usually a few weeks into her pregnancy, and it's fertilized and implants in the uterus. The result is two separate pregnancies happening at the same time.
A fertilized egg is made with one egg and one sperm. If it splits in two, which happens sometimes, you have identical twins. If one of those eggs separates again, you'll have identical triplets, and so on. All the babies start with the same gene set: They're either all boys or all girls, and they'll look alike.
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).
The average length of a pregnancy for triplets is 32 weeks. For quadruplets, the average length is 30 weeks. Continuing a multiple pregnancy past 36 weeks can be risky for you and your babies. So, it's usually considered best to deliver them early.
“Most experts put the odds of identical triplets at one in 200 million births,” Tiberius said. “I talked to a statistician and apparently the odds of a 45 year old having identical triplets are one in 20 billion.” It's quite rare to become pregnant without medical intervention at 45, according to Dr.
Around the world, the chances of having twins for a couple is 1 per cent, and the rate for China is 0.5 per cent, according to Yu Rong, an obstetrician from Xuanwu Hospital in Beijing.
Most sets of Twins
1707–c. 1782), a peasant from Shuya, Russia, gave birth to 16 sets of twins. Barbara Zulu of Barberton, South Africa bore 3 sets of girls and 3 mixed sets in seven years (1967–73).
South Korea has the world's lowest fertility rate, a struggle with lessons for us all. A woman holding her daughter looks at a view of Seoul in 2019. The fertility rate in South Korea, which has the world's lowest rate, hit 0.78 in February.