Trizygotic or fraternal triplets are formed when three separate eggs are fertilised by three separate sperm. The babies can be the same or opposite genders. This means that it's possible to have anyone of the following combinations of babies – three girls/three boys or, one girl and two boys or two girls and one boy.
They can be the same or opposite genders. Triplets can also occur when two of the babies are identical and have formed from monozygotic (identical) twins – see below.
Trizygotic or fraternal triplets can be the same or opposite genders (three boys / three girls / one boy, two girls / two boys, one girl). Triplets can also happen when two separate eggs are fertilized by two different sperm, and one of those eggs splits into two, forming monozygotic (identical) twins.
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.)
Triplets can be either fraternal, identical, or a combination of both. The most common are strictly fraternal triplets, which come from a polyzygotic pregnancy of three eggs. Less common are triplets from a dizygotic pregnancy, where one zygote divides into two identical fetuses, and the other does not.
Fraternal triplets: When three separate eggs become fertilized. Fraternal triplet pregnancies result in babies that might not all be the same gender or look the same. Their DNA is like that of a biological sibling. Identical triplets: They occur when one fertilized egg splits into three embryos.
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).
Types of triplets
All 3 babies have separate amniotic sacs. Dichorionic diamniotic triplets – 1 baby has a separate placenta and amniotic sac, and 2 of the babies share a placenta and amniotic sac. Monochorionic triamniotic triplets – all 3 babies share 1 placenta but each has its own amniotic sac.
According to health experts, the odds of conceiving triplets naturally is one in 9,000 and the odds of it happening twice is one in 64 million.
Yes, it is possible. Because superfecundation happens from different sexual encounters, it's possible that a woman is pregnant with triplets or twins with different fathers. The number of babies depends on the number of ova released by the woman in that one cycle.
“Triplets are rare. Twins happen about 1 every 80 births or so. But triplets, natural triplets, are about 1 every 8,000 births,” said Dr. Joshua Petrikin, a pediatrician and neonatal specialist at University Health.
Triplets are classified as follows: Trichorionic-triamniotic (Tri-Tri) triplets: Each triplet has its own placenta and amniotic sac. Dichorionic-triamniotic (Di-Tri) triplets: Two of the triplets share a placenta, with separate amniotic sac, and the third triplet has its own placenta and amniotic sac.
Yes, it is possible for a baby to have two biological fathers through the phenomenon known as “bipaternalism” or “heteropaternal superfecundation”. This occurs when a woman ovulates twice within the same menstrual cycle and has sexual intercourse with two different men during that time.
Septuplets (7)
The Frustaci septuplets (born 21 May 1985, in Orange, California) are the first septuplets to be born in the United States. Born at 28 weeks, only two boys and one girl survived; one daughter was stillborn and three died within 19 days of birth.
If you are pregnant with triplets or more, the birth will need careful planning. The main risk with carrying multiples is that they will be born prematurely. Your medical team will help you plan your babies' birth. This may include deciding where and when your babies will be born.
Dr Murphy again: “The probability of having a boy or a girl from a genetics point of view, remain the same each time a baby is conceived. However, there is some epidemiological evidence to suggest other factors may influence sex determination in humans.
There is hence a 1 in 2 chance (50% or 0,5 probability) of either a boy or a girl on each occasion. Therefore, by the multiplication principle, the probability of having 3 girls in a row is 12×12×12=18 . The sex of the 4th child is independent of the sexes of the previous 3 and hence is once again 12 .
This means the baby has three genetic parents: the father who supplied the sperm, the mother who supplied both womb and the egg nucleus, and an anonymous donor who supplied healthy mitochondria.
If you're carrying two babies, they are called twins. Three babies that are carried during one pregnancy are called triplets. You can also carry more than three babies at one time (high-order multiples).
Triplets, quadruplets, quintuplets, sextuplets or more can be a combination both of identical and fraternal multiples. For example, triplets can be: fraternal (trizygotic), forming from 3 individual eggs that are fertilised and implant in your uterus. identical, when one egg divides into 3 embryos.
The Guinness World Records for most children delivered at a single birth to survive is currently held by Nadya Suleman, who gave birth to six boys and two girls in California, US, in 2009. Last month, a 25-year-old Malian woman had given birth to nine babies, two more than doctors had detected during medical scans.
One study estimated a woman can have around 15 pregnancies in a lifetime. And depending on how many babies she births for each pregnancy, she'd probably have around 15-30 children. But the "most prolific mother ever," according to Guinness World Records, was Mrs.
The majority of triplets are what is known as trizygotic. They are formed when 3 separate, individual eggs are fertilized by 3 separate sperm.