Scientists have figured out why so many twins are born lately.
When planning a pregnancy every now and then looking at the ovulation calendar, you definitely came across information that the number of twins is constantly growing among newborns. Statistics reports that in the United States in 1980, there were an average of 18.9 pairs of twins per 1,000 babies, in 2013 - 33.7, in 2014 - 33.9. What is the reason for this phenomenon?
Experts say that the main reason for the emergence of a large number of twins is the use of productive technologies: drugs that increase fertility, artificial insemination and in vitro fertilization (ECO), recognized as the most common method. As a rule, women of mature age resort to the use of these methods.
Scientists have concluded that the birth of twins or even triplets after IVF is justified by the features of the procedure.When it is performed, doctors transplant several embryos into the mother’s uterus to increase the chances of having a baby. Despite such measures, even several implanted embryos do not guarantee pregnancy, so some women can do this procedure several times. Thanks to IVF, in 2011, 36% of all twins were born in the USA.
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The second reason for the increase in the number of twins, scientists callincrease in mothers age. The bottom line is that in the body of women before the end of the reproductive period, hormonal changes occur, which is why two eggs begin to mature in each menstrual cycle. That is, the chance to give birth to fraternal twins increases.
The third reason doctors calleduse of oral contraceptives.They contain hormones that block ovulation. That is, fertilization does not occur, because the egg does not leave their ovary. When contraceptives are no longer used, two eggs can be released at once and both are fertilized, which is why twins are born.
In addition, scientists from the Netherlands believe that the birth of twins can also affect factors such as smoking and even the growth of the mother.