The world of fertility treatments has seen a big change with in vitro fertilization (IVF). This method has made it possible for more people to have children. However, it has also led to some unexpected results. One of these is the rise in the number of twins. This is because IVF often involves putting more than one embryo into the womb. This increases the chances of having twins. But here is where it gets interesting. IVF has also led to a higher number of boy-girl twin pairs. This is because IVF can help parents choose the gender of their babies. This is done through a process called preimplantation genetic screening (PGS). This process lets parents pick the gender of their children before the embryo is implanted. This has led to a big increase in the number of boy-girl twins.

This trend has been studied using data from Taiwan. The study looked at millions of records. It found that the number of boy-girl twins has gone up a lot in the past 30 years. In fact, the proportion of boy-girl twins has more than doubled. This increase is even more noticeable among wealthier and older mothers. The study also found that parental preference plays a big role in this trend. About 11% of boy-girl twins among the wealthiest families are a result of parents wanting a mix of genders.

The study also looked at how socioeconomic factors play a role. It found that wealthier families are more likely to use IVF. This is probably because IVF can be expensive. The study also looked at how the use of IVF has changed over time. It found that the use of IVF has increased a lot in the past few decades. This is likely due to advances in technology and a greater acceptance of fertility treatments.

The rise in boy-girl twins raises some important questions. It is important to think about the ethical implications of gender selection. It is also important to consider the social impact of these trends. As IVF becomes more common, it will be important to continue studying these trends. This will help ensure that fertility treatments are used in a way that is fair and beneficial for everyone.

The study found that the proportion of boy-girl twins is significantly higher than what would be expected by chance. This suggests that parental preference is a big factor in this trend. It is important to note that this trend is not just about personal preference. It is also about the broader societal factors that influence these preferences. For example, some cultures may place a higher value on having a mix of genders in a family. This can influence parents' decisions about gender selection. It is also important to consider the role of technology in this trend. As IVF becomes more advanced, it will be easier for parents to choose the gender of their children. This raises important questions about the ethical implications of gender selection.

How IVF is Changing the Gender Mix of Twins

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