Which twin is the first born?

The twin born first is generally considered the older twin in most cultures, but there are exceptions, and sometimes the "second" twin can be technically older due to birth time (like daylight savings) or cultural beliefs where the first twin out (Taiwo) is the "younger" (tested) and the second out (Kehinde) is the elder. Medically, twins are often labeled Baby A (lowest in uterus/first out) and Baby B (higher/second out) during ultrasounds, but this can switch at birth, causing confusion.

When twins are born, which one is the oldest?

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. 

Which twin will be born first?

In prenatal ultrasounds, the baby positioned lowest in the uterus is given the designation of "Baby A." Under this convention, Baby A will likely be born first in a vaginal delivery.

Does it matter which twin is born first?

Despite the clinical impression that firstborn twins do better than second-born twins, recent reports have shown no difference in perinatal mortality between them.

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.

5 SIGNS YOU MAY BE PREGNANT WITH TWINS!!! | Early Pregnancy Symptoms

Which parent passes on the twin gene?

For a given pregnancy, the odds of conceiving fraternal twins are only determined by the mother's genetics, not the father's.

Can a baby have two fathers DNA?

Heteropaternal superfecundation is an extremely rare phenomenon that occurs when a second ova released during the same menstrual cycle is additionally fertilized by the sperm cells of a different man in separate sexual intercourse taking place within a short period of time from the first one 1-4.

Does the father's side affect twin births?

Fraternal twin pregnancies result from hyperovulation of the mother. The father's sperm does not decrease or increase the chance of having twins. Skipping a generation can happen in some cases, depending on whether the twins are boys or girls.

Which twin is more dominant?

Classically, the bigger twin is the more physically dominant. It's basic human nature, and particularly applicable to boys as they hit puberty. It happens often with singleton siblings too… the older is bigger and enforces him/herself through physical dominance.

Can two sperm fertilize 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.
 

Why do twins not go past 38 weeks?

Most patients with twins do not make it past 38 weeks due to labor, ruptured membranes, or some other compelling reason to deliver (hypertension or fetal growth restriction, for example).

Are twins one soul?

Twins, whether identical or fraternal, are considered to have separate souls and are therefore seen as two distinct individuals from the moment of conception. The Catholic Church teaches that each person is individually created and known by God, and that the soul is a unique and irreplaceable gift from God.

Do twins actually have a longer life expectancy?

While both fraternal and identical twins outperformed their non-twin counterparts, identical twins showed even greater gains in life expectancy over fraternal twins, leading scientists to theorize that identical twins perhaps form deeper bonds due to an enhanced ability to predict their sibling's needs.

Is twin a always born first?

Most often, fetuses known in utero as twin A are also first born and thus retain their label. However, this is not always the case, such that the twin A newborn was previously labeled twin B in utero and vice versa.

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.

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.

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.
 

What triggers twins?

Twins are caused by either one fertilized egg splitting (identical twins, same DNA) or two separate eggs being fertilized by two different sperm (fraternal twins, unique DNA), with fraternal twinning often linked to genetics (hyperovulation), maternal age (over 35), family history, and assisted reproduction, while identical twins are random but can be increased by ART.
 

Why can't you say siamese twins?

You can still say "Siamese twins," but it's outdated and often replaced by the more accurate and sensitive term, "conjoined twins," because the original term links to historical "freak shows," isn't geographically accurate for most cases (as it comes from Chang and Eng Bunker of Siam, now Thailand), and can feel dehumanizing, similar to outdated terms for other conditions. "Conjoined twins" is the preferred medical and respectful term for twins physically joined in utero. 

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). 

Can babies sense when their dad is gone?

Between 4–7 months of age, babies develop a sense of "object permanence." They're realizing that things and people exist even when they're out of sight. Babies learn that when they can't see their caregiver, that means they've gone away.

Can two men fertilize one egg?

Biological Fatherhood

A single sperm is used to fertilize a single egg. The question that often comes up is, can both guys from a gay male couple mix their sperm together? The simple answer is no.

Can a woman have twins with two different guys?

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