What does baby A and baby B mean?

Starting at about the 24-week mark, those babies can clearly establish their own territories. Often, baby A (so named because she's closest to the cervix and therefore likely to be born first) will stay on one side while baby B stays on the other. The less room they have, the less likely they are to move around.

How do they decide baby A and baby B?

For vaginal delivery of both infants, the twins decide birth order by their placement in the uterus. Once the babies are large enough to stay in one position in the womb, the twin lowest in the uterus is known as Baby A and the one furthest from there is Baby B, according to the Stanford Medicine News Center.

Can baby A and baby B switch?

There are scenarios where a cesarean is advisable in a twin birth, such as when both babies are breech. Usually, this is known ahead of time with ultrasound technology. However, twins can change positions late in the game, even into labor. This is particularly true of Twin B after the birth of Twin A.

How is twin A and B determined?

OBJECTIVE: By convention, twins are labeled as twin A or twin B at the time of birth, depending on their birth order. However, antenatally twins are labeled as A or B according to their location relative to the birth canal. Antenatal labeling is usually established by prenatal ultrasound.

What is the meaning of two babies?

Definition of twin

(Entry 1 of 3) 1a : either of two offspring produced in the same pregnancy. b Twins plural : gemini. 2 : one of two persons or things closely related to or resembling each other.

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Can twins have two different fathers?

But you may be left wondering: Can twins have different fathers? The answer is yes, but only in cases in which they're fraternal, as identical twins form from a single egg/sperm combination and thus cannot have different fathers.

What are the 3 types of pregnancy?

What are the 3 types of twins?

Who is most likely to have twins?

Age. According to the Office on Women's Health , women who are aged 30 years or older are more likely to conceive twins. The reason for this is that women of this age are more likely than younger women to release more than one egg during their reproductive cycle.

Which twin is conceived first?

#1 Fraternal twins can be conceived as much as 24 days apart

For this reason, fraternal twins can be conceived a few weeks apart, though they generally will be born at the same time.

Who is elder in twins?

Tell them the Nigerian legend that the oldest twin actually pushes the younger twin out of the womb. So the firstborn is really the youngest. Answering the “which twin is older” question from strangers is one thing.

What is the best position for twins in the womb?

How your babies lie in the womb. The most common way for twins to lie is both with their heads down - the best for birth. There's not a lot of room in your womb, so it's quite common for one or both babies to be feet or bottom down (breech).

Is a twin pregnancy harder?

Rob Atlas, M.D., an ob-gyn at Mercy Medical Center in Baltimore, calls twin pregnancies "double trouble." Moms carrying twins are at higher risk for premature birth, high blood pressure, and—especially in the case of identical twins—fetal abnormalities.

Can a twin eat another twin in the womb?

Vanishing twin syndrome was first recognized in 1945. This occurs when a twin or multiple disappears in the uterus during pregnancy as a result of a miscarriage of one twin or multiple. The fetal tissue is absorbed by the other twin, multiple, placenta or the mother.

Is the second twin the oldest?

The second baby to be born is actually older.

Can 2 sperm fertilize the same egg?

Occasionally, two sperm are known to fertilize a single egg; this 'double fertilization' is thought to happen in about 1% of human conceptions. An embryo created this way doesn't usually survive, but a few cases are known to have made it — these children are chimaeras of cells with X and Y chromosomes.

Which parent carries twin gene?

The gene versions that increase the chance of hyperovulation can be passed down from parent to child. This is why fraternal twins run in families. However, only women ovulate. So, the mother's genes control this and the fathers don't.

Can you get pregnant while pregnant?

A double pregnancy, or superfetation, is extremely rare — in fact, there aren't even stats on how often it happens — but it's scientifically possible. We're not saying you should worry about it happening to you, just that you can't say that it's impossible.

Can you have twins if it doesn't run in your family?

Remember, monozygotic (identical) twins don't run in families—they are random. You may not know if your great-granduncles were identical or not and often there is no way to know for sure without DNA testing. That being said, twins that share a close physical resemblance are more likely to be identical than fraternal.

What are Didi twins?

In a di/di pregnancy (more scientifically referred to as a dichorionic diamniotic pregnancy) the twins each have their own chorionic and amniotic sacs. Essentially, each of the babies is growing like they would as a singleton, but just a little more cramped, because they're sharing the same womb.

What are twins called that are born on different days?

When people refer to Irish twins, it's important to recognize that although the siblings are close in age, they are not actually twins. In other words, they were not born during the same gestational period. Calling them Irish twins is just an informal way of classifying siblings that are born close together.

Can twins be born years apart?

According to the Centers for Disease Control and Prevention, twin births occur 120,000 times per year in the US, about 3% of all births. Natividad Medical Center - the Salinas hospital that delivered the babies - estimates the likelihood that twins are born in different years is about one in two million.

What is a double pregnancy?

Superfetation is when a second, new pregnancy occurs during an initial pregnancy. Another ovum (egg) is fertilized by sperm and implanted in the womb days or weeks later than the first one. Babies born from superfetation are often considered twins since they may be born during the same birth on the same day.

What are 5 twins called?

Quintuplets are a set of five babies born in one birth. A baby that is part of such a set is called a quintuplet and sometimes referred to as a "quint."