Which twin will be born first?

Baby A 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. In the majority of vaginal births, Baby A is born first.

romper.com - How Do They Decide Which Twin Comes Out First? Birth Order Is A ...

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Birth order carries a lot of significance for some siblings, often well into the adult years. Even an age difference of minutes can matter. With this in mind, how do they decide which twin comes out first during delivery?

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. In the majority of vaginal births, Baby A is born first. But occasionally the twins switch positions at the last minute, and Baby B emerges first, as further noted by the Stanford Medicine News Center. Still, the birth order is relatively straightforward. When Cesarian section deliveries enter the picture, however, twin birth order can get more complicated. As many as 75 percent of twin births involve a C-section, according to HuffPost. (A few women even deliver one twin vaginally and the second via C-section.) If the lowest twin is in breech position, for instance, then a C-section may be necessary for both babies, according to Baby Center. In general, the infants are still delivered in the order of Baby A followed by Baby B. It's reasonable to imagine instances in which Baby B would need to be delivered first due to health complications, but there does not appear to be a recorded case of this occurring. With all the emphasis on older and younger siblings, parents of twins face an important question: Do you even tell the kids about their birth order? Some parents withhold this information so birth order doesn't cause conflict in the twins' relationship, according to Very Well. Hey, for some kids being seven minutes older than a sibling is a huge deal. On the flip side, some parents acknowledge which twin was born first openly, in the spirit of truthfulness, as explained in Motherwell. In either case, the twins likely made this decision on their own in the womb, so there's no reason for contention. After all, other siblings don't get any choice in the matter of birth order.

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Why are twins so special?

Twins share the same genes but their environments become more different as they age. This unique aspect of twins makes them an excellent model for understanding how genes and the environment contribute to certain traits, especially complex behaviors and diseases.

learn.genetics.utah.edu - Insights From Identical Twins - Genetic Science Learning Center

Chromosome 3 pairs in each set of twins are digitally superimposed. One twin's epigenetic tags are dyed red and the other twin's tags are dyed green. When red and green overlap, that region shows up as yellow. The 50-year old twins have more epigenetic tags in different places than do 3-year-old twins. The insight we gain from studying twins helps us to better understand how nature and nurture work together. For well over a century, researchers have compared characteristics in twins in an effort to determine the extent to which certain traits are inherited, like eye color, and which traits are learned from the environment, such as language. Typically taking place in the field of Behavioral Genetics, classical twin studies have identified a number of behavioral traits and diseases that are likely to have a genetic component, and others that are more strongly influenced by the environment. Depending on the study and the particular trait of interest, data is collected and compared from identical or fraternal twins who have been raised together or apart. Finding similarities and differences between these sets of twins is the start to determining the degree to which nature and environment play a role in the trait of interest. Twin studies have identified some traits that have a strong genetic component, including reading disabilities like dyslexia. Other traits, like arthritis, are more likely influenced by the environment.

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