Which twin is rarest?

The rarest type of twins are semi-identical twins (sesquizygotic), with only a couple of confirmed cases globally, occurring when one egg is fertilized by two different sperm, creating genetically unique but partially identical siblings. Another exceptionally rare type are monoamniotic-monochorionic (MoMo) twins, who share one placenta and one amniotic sac, leading to high risks like umbilical cord entanglement, making them the riskiest type of twin pregnancy.

Why can't you say siamese twins?

You can still say "Siamese twins," but it's outdated and often seen as insensitive; the preferred term is conjoined twins, because "Siamese" refers specifically to Chang and Eng Bunker from Siam (now Thailand), and not all conjoined twins are from there, making the term inaccurate and potentially linking to past "freak show" exploitative contexts. Using "conjoined twins" is more precise, respectful, and inclusive of all cases, regardless of origin. 

Which twin is the eldest?

The twin born first is technically older by birth date, but medically they are considered the same age as they developed from the same pregnancy; however, cultural views vary, with some traditions (like some in China) considering the twin born last as older, as they were "deeper" in the womb. For most practical purposes and legal definitions, the one who emerges first is the elder, though many twins just consider themselves the same age. 

What are the riskiest twins?

The highest-risk twin pregnancy is Monochorionic-Monoamniotic (Mo-Mo), where identical twins share one placenta and one amniotic sac, leading to extreme risks like umbilical cord entanglement, which can cut off blood flow, and Twin-to-Twin Transfusion Syndrome (TTTS), often requiring very early hospital admission and delivery. Other high-risk factors include monochorionic twins (sharing a placenta but different sacs) and general twin pregnancy risks like preeclampsia, gestational diabetes, premature birth, and intrauterine growth restriction (IUGR). 

What does God say about twins?

God's perspective on twins, particularly in the Bible, highlights their unique destinies and the fulfillment of His plans through them, most famously with Jacob and Esau, where God declared the younger would rule the older, signifying divine purpose over birth order. The Scriptures show God using twins to form nations, illustrate complex family dynamics, and reveal His sovereign choice, with other biblical twins like Perez and Zerah and the ship's figurehead (Dioscuri), showing twins as significant, sometimes symbolic, figures in His unfolding story. 

6 Types of Twins That Are Extremely Rare

What parent passes down the twin gene?

For fraternal (dizygotic) twins, the genetic tendency for hyperovulation (releasing more than one egg) is often passed through the mother's side, meaning the pregnant parent's genes are key, but the father can carry and pass this trait to his daughters, increasing their future chances. For identical (monozygotic) twins, genetics play a minor role, as they usually occur randomly when one fertilized egg splits, though some rare genetic factors might influence the split.
 

Which twin is usually bigger?

As expected, first-born twins had greater birth weight than second-born twins. With respect to height, first-born twins were slightly taller than second-born twins in childhood. After adjusting the results for birth weight, the birth order differences decreased and were not statistically significant anymore.

Who is the oldest twin alive?

Congratulations to Umeno Sumiyama and Koume Kodama. They have been certified as the world's oldest living identical twins by Guinness World Records. Born in Japan on November 5, 1913, they are the third- and fourth-born of 11 siblings - breaking records at 107 years young. Omedetou gozaimasu.

Which twin is the father?

A standard paternity test won't be able to tell which twin is the true father. Even a more sensitive ancestry-type test (like 23andMe) won't be able to answer this question. You'd need to look at each twin's complete set of DNA (all 6 billion letters!) and see if there are any random differences between them.

Are Abby and Brittany legally two people?

Abby and Brittany are legally two separate people – except at work.

What if one conjoined twin dies?

If one conjoined twin dies, the surviving twin faces extreme risk, often from sepsis or organ failure due to shared blood supply, necessitating emergency surgical separation to remove the dead tissue, though this surgery itself is highly dangerous and can lead to the death of the survivor, highlighting the critical dependency in many conjoined pairs. Survival largely depends on shared anatomy, but the decaying tissue poisons the living twin, making swift action crucial for the best chance of survival, which remains low for many cases. 

Can twins have different fathers?

It is possible for twins to have different biological fathers. This phenomenon is known as heteropaternal superfecundation, and can occur when a woman releases multiple eggs during her menstrual cycle and engages in sexual intercourse with different partners in close succession.

Do conjoined twins feel the same pleasure, Abby and Brittany?

Yes, for conjoined twins like Abby and Brittany, sensations, including pleasure, often overlap due to shared anatomy and circulatory systems, meaning one twin can feel what the other feels in shared areas, leading to potentially simultaneous experiences, though individual control and perception still vary. They share reproductive organs from the waist down, leading to shared physical responses like orgasm, and hormonal responses from touch or kissing can transfer, but perception differs as they are distinct individuals.
 

Can two sperm enter one egg?

Yes, two sperm can fertilize one egg, a rare event called polyspermy, which usually leads to an unviable embryo with three sets of chromosomes, often causing early miscarriage. However, in extremely rare cases, it results in semi-identical twins (sesquizygotic twins), where a single egg is fertilized by two sperm, creating offspring sharing all maternal DNA but only some paternal DNA, a unique form of chimerism.
 

Do twin moms live longer?

Compared with other mothers, women who deliver twins live longer, have more children than expected, bear babies at shorter intervals over a longer time, and are older at their last birth, according to a new study.

Which baby is older in twins?

The twin born first is technically older by birth date, but medically they are considered the same age as they developed from the same pregnancy; however, cultural views vary, with some traditions (like some in China) considering the twin born last as older, as they were "deeper" in the womb. For most practical purposes and legal definitions, the one who emerges first is the elder, though many twins just consider themselves the same age. 

What happened to Anna and Lucy twins?

They are now engaged to their partner Ben who they've shared for the past 11 years. "Sharing a boyfriend for us means we get to be together all the time," said Anna prior to their engagement. With Lucy adding, "There's no jealousy in this relationship. If Ben kisses Anna, he'll kiss me straight after."

Who carries the gene for twins?

The tendency for fraternal twins is genetic and carried by the mother, specifically a gene for hyperovulation (releasing multiple eggs) that she inherits from her mother or father, but it's the woman who ovulates multiple eggs who has twins, not the father. A father can pass the gene to his daughters, increasing their chances, but his own family history of fraternal twins doesn't directly affect his partner's odds, though factors like age, diet, and fertility treatments also play a role. Identical twins, however, are generally not genetic and occur randomly when one fertilized egg splits.
 

Who was the heaviest twins born?

The heaviest twins at birth on record, according to Guinness World Records, are Patricia Jane and John Prosser Haskin, Jr., born in Arkansas on February 20, 1924, with a combined weight of 27 pounds, 12 ounces (12.58 kg), though reports also mention a 1927 pair with the same weight. A more recent, well-documented set of large twins were the Maynard twins (Sean and Abigail), born in North Carolina in 2008, weighing a combined 23 pounds, 1 ounce. 

Why can't twins go past 37 weeks?

This study found a mean gestation at birth for twins of 37 weeks, with the risk of stillbirth and early neonatal death increasing after 38 weeks gestation. The lowest risk of perinatal death in twin pregnancies at 38 weeks gestation corresponded to that observed in singleton pregnancies at 43 weeks gestation [7].

Who carries the DNA for twins?

The genetic predisposition for twins only affects the mother (or pregnant partner). The other parent can pass down these genetic traits to their children. Still, they won't be more likely to have twins themselves unless the pregnant parent or surrogate also has a family history of twins.

What is the main cause of twins?

People have twins through two main ways: identical (monozygotic) twins from one egg splitting, which is random, and fraternal (dizygotic) twins from two eggs fertilized by two sperm, often influenced by genetics, maternal age (over 30s), and fertility treatments. Factors like family history, previous pregnancies, and certain genes (FSHB, SMAD3) increase chances for fraternal twins, while identical twins result from an unpredictable early embryo split.
 

How to get pregnant with twins?

To increase your chances of getting pregnant with twins, the most effective method is using fertility treatments like ovulation-stimulating drugs (Clomid, Letrozole, Gonadotropins) or IVF, which prompt the release of multiple eggs or implant multiple embryos, but these carry risks. Natural factors that raise your odds include being over 35, having a family history of fraternal twins (on the mother's side), being taller or having a higher BMI, and having previously carried twins, though genetics and diet have limited proven impact. Always discuss these options and risks with a fertility specialist.