Why are twins born first heavier than those born later?

Because the one that comes out first is very nutritious, it will be a little more massive.

The nutrients absorbed by the two embryos are different, and the ones that just come out are heavier.

This is because there will be a certain difference between the words between the two.

More twins are being born than ever beforeBecause of assisted reproductive technologyIt began to rise in the 70s of the last centuryPushing for an increase in the number of twins, coupled with older maternal age, the chance of conceiving twins is also higher

According to Agence France-Presse on March 12, a study published in Human Reproduction found that more than 1.6 million pairs of twins are currently born each year.

According to the report, researchers collected data from 135 countries from 2010 to 2015. According to the study, Africa has the highest twin birth rate in the world because of the "genetic differences" between Africa and the rest of the world.

In addition, the researchers say the increase in twin births in poorer parts of the world is worrying. Smith, co-author of the study, said: "More attention needs to be paid to the ...... fate of twins in low- and middle-income countriesEspecially in sub-Saharan Africa, many twins lose siblings a year after birth.

For families who want to conceive babies, if they can give birth to a pair of twins at a time, it is a very happy and lucky thing, and everyone's feeling is that in recent years, we have seen and heard in the news or around us that the birth rate of twins or multiple births is getting higher and higher, what is the reason for this? <>

Nowadays, with the development of the Internet, people are receiving news more and more frequently. In the early years, if a news event wanted to be published in a newspaper, someone needed to give the reporter a clue, and the reporter would only publish it as news after the reporter went to interview, and people might not know and know about the occurrence of some events so quickly. And now the network is so developed, in addition to the official **, many people have their own self-**, or circle of friends, etc., these are channels that can spread information, whichHaving twins has become more common, and people are seeing and hearing it much more often than in previous years.

With the development of medical technology, IVF projects have been added to the ** for infertility. Some people find it difficult to get pregnant because of some physical reasons, so they will carry out manual intervention, such as in the form of IVF, so that they can conceive a baby, and at least two to three embryos will be implanted at a time for IVF, which is also a reason for the increased chance of twins. <>

The development of science and technology and the standardization of pregnancy testing have improved the probability of successful childbirth for pregnant women who are pregnant with twins. In the early years, people did not have the concept of prenatal checkup, and for pregnant women who were pregnant with twins, there were various risks throughout the process of pregnancy, so it was likely that some dangerous things would happen in the process of pregnancy, resulting in the failure to give birth to twins. Now that medical care is so developed, people are becoming more and more standardized for pregnancy testing, and the entire pregnancy and delivery process will be completed under the guidance of doctors, which makes people who are pregnant with twins basically able to give birth successfully, which is also a reason why people think that the birth rate of twins is getting higher and higher.

Because of the development of medicine. If there is a physical defect, you can apply for IVF, and the possibility of having twins with medical intervention is increasing.

Because many people choose to do IVF. IVF is a great convenience for many infertile families, and IVF is often able to give birth to twins, twins, and the birth rate of twins is getting higher and higher.

In recent years, the birth rate of twins has been increasing, some of them are born naturally, and some of them are artificially helped. This phenomenon also has a certain relationship with the current social development.

The main reason is that in recent years, the living conditions have improved, and the health of the human body has also improved.

Because now medicine is becoming more and more developed, twin conception can be completed by special means, so the twin birth rate is getting higher and higher, and it is really good to have twins.

Because with the development of medicine, twins can also be conceived through the help of hospitals, so now the twin birth rate is getting higher and higher.

Twins are genetically related to age, and studies have shown that women are most likely to conceive twins between the ages of 35 and 39. The increase in twins is also related to the current environment. Because in reality, many foods contain hormones, and after these hormones enter the body, they are not only easy to cause obesity, but also make women easy to excrete multiple eggs.

There are also twins that are not conceived naturally and are conceived through artificial insemination.

Part of it is because of family inheritance, and part of it is because of the fact that medical technology is more developed nowadays, and twins can be obtained through medical means.

A: Part of the reason is because of genetic problems. In addition, the level of medical care has also improved, and the chance of having twins can be increased by taking medications.

Because our hygiene has improved so well, we have used scientific methods in the process of preparing for pregnancy, and we can have the ability to request professional **, ** will also strengthen this coverage.

Because life is getting better and better, people's bodies are getting healthier, so the chance of twins being born is getting higher and higher.

Mainly because there are more and more babies doing IVF now, the birth rate of twins will be higher and higher, which also shows that our medical conditions are much better than before. Many couples who are unable to have children are able to conceive their babies through IVF.

The living conditions are good, and there is IVF technology, so whether you want twins or multiple births, it is not a problem.