Every year, there are always more baby boys than girls born in England and Wales. Since records began in , the cries of babies born every year have been predominately male. In not one year, stretching back to the start of Queen Victoria's reign, have girls outnumbered boys at birth. In , in England and Wales, for example, there were , live male births and , live female births - a difference of roughly 17, And that higher tally of males compared to females born each year is a pattern that has repeated itself for nearly years.
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It's all about Dad's genes
You may have heard that the odds of conceiving a boy or a girl is about This method details when and how to have sexual intercourse in order to conceive either a boy or girl. Related: How to increase your chances of getting pregnant. The Shettles method has been around since the s. It was developed by Landrum B.
It's all about evolution
A new chemical treatment that can segregate male and female sperm could one day mean parents going through IVF could choose whether they have a boy or girl. Scientists discovered the sperm with the X chromosome which gives rise to females slowed down when when a certain chemical was added while sperm with the male Y chromosome sped up. In experiments with mice sperm, scientists found they could produce litters that were 90 per cent male, according to the study published in Plos Biology. When the slower sperm were used, litters were 81 per cent female. The X chromosome has many genes while the shorter male Y chromosome has fewer, and this difference in gene expression meant scientists could distinguish between the two. Researchers, led by Masayuki Shimada from Hiroshima University, believe this technique is likely to be applicable to other mammals. The process — which could be simple and cheap to carry out — does not damage the DNA of sperm and could greatly simplify sex selection for IVF or artificial insemination, which is used in livestock, scientists say.
A Newcastle University study involving thousands of families is helping prospective parents work out whether they are likely to have sons or daughters. The work by Corry Gellatly, a research scientist at the university, has shown that men inherit a tendency to have more sons or more daughters from their parents. This means that a man with many brothers is more likely to have sons, while a man with many sisters is more likely to have daughters. The research involved a study of family trees containing information on , people from North America and Europe going back to