Every year, there are always many boys born, not only in England and Wales but all over the world. Why so?
According to the BBC news agency, since the data began to be recorded in 1838, the number of babies born every year is mostly boys. Since the beginning of the reign of Queen Victoria, there have not been any more girls born than boys.
For example, in 2017, in England and Wales, 348,071 boys were born, and 331,035 girls were born – a difference of about 17,000 babies.
And that has been repeated for almost 180 years. A ratio of hundred five boys to hundred girls is considered normal.
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Not only in UK but worldwide, the situation is similar, although, in some countries like China and India, this gap is even more full because people prefer boys.
More surprisingly, this ratio has been known since the 17th century.
But why this ratio exists, we still have not fully understood, although there are quite a lot of theories.
That is evolution
The first hypothesis is an evolutionary theory, which says that to achieve a balance between men and women of adulthood, the number of boys born must be a little more.
That’s because more risks happen to men. Men are more likely to die before adulthood as well as in every stage of life than women – possibly caused by accidents, dangerous acts, suicide, and health problems.
“At all ages, in almost every time and place, a man is more likely to die than a woman” – says Professor David Steinsaltz, Associate Professor of Statistics at Oxford University. share with BBC news agency.
Therefore, at the time of birth, the number of boys more than girls will ensure that the number of men is equal to that of women at the time of adulthood.
However, women are more mature than men in the UK, and they live much longer, accordingly to data from Office of National Statistics.
Sperm and time
Many different factors can determine whether a male sperm (carrying a Y chromosome) or a female sperm (carrying an X chromosome) will be the first sperm to enter the woman’s egg. Female.
These include parents’ age, women’s ovulation cycle, stress level, diet, and posture during bed time.
Standard theory is that the likelihood of having a girl increases when having cross for many days before ovulation and then restraining it so that female sperm, which lives longer but swims slower than male sperm, prevail their “rival.”
On the other hand, if it acts close to ovulation or later, the best swimming sperm will come first and create boys.
Parents can “trust” these techniques, but scientists say there is little evidence that they create differences.
There are also some studies that stress parents can lead to more baby girls, while if they live through wars and conflicts, the likelihood of having a baby will be higher.
The ability to survive in the uterus
If you think that having cross doesn’t affect your baby’s gender, is there anything else going on during pregnancy?
If the number of female and male sperm is equal and the ability to conceive is similar, then the number of female fetuses that cannot be retained must be higher, thereby winning the number of male fetuses.
Some studies suggest that female fetuses are more likely to be lost in the uterus in the early stages of pregnancy, but some studies show that male fetuses are more likely to experience problems during pregnancy and lead. To more stillborn fetuses.
Scientists say it is difficult to determine what is going on and why.
What we know for sure is that more and more boys are formed and born than girls.