My general response is that it's a 50/50 chance that a woman will have a boy or a girl. But that's not exactly true – there's actually a slight bias toward male births. The ratio of male to female births, called the sex ratio, is about 105 to 100, according to the World Health Organization (WHO).
You're most fertile at the time of ovulation (when an egg is released from your ovaries), which usually occurs 12 to 14 days before your next period starts. This is the time of the month when you're most likely to get pregnant.
Developed by Elizabeth Whelan, this method revolves around the times when a woman's body is more favorable to either the X-sperm or the Y-sperm based on her menstrual cycle. For a girl, a couple should have sex two or three days before ovulation or on the day of ovulation to increase their odds of having a girl.
Dr Michael Thomas MD (fertility specialist) actually advises that there are no methods to affect the sex of your child, including sexual position.
Almost everyone has around a 50% chance of having a boy and a 50% chance of having a girl. What we can say is that dad's sperm determines whether a baby will be born as a boy or a girl. About half of his sperm will make a boy and half a girl. The sex of the baby depends on which sperm gets to the egg first.
Previous studies have repeatedly found that one of the reliable predictors of the sex of the offspring is the age of the parent. Older parents are significantly more likely to have daughters than younger parents.
All men inherit a Y chromosome from their father, which means all traits that are only found on the Y chromosome come from dad, not mom. The Supporting Evidence: Y-linked traits follow a clear paternal lineage.
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.
They found that the most fertile months for conceiving a boy were from September to November, while the lowest fertile period was from March to May.
We might expect that naturally an equal number of boys and girls are born, but this is not the case. There are biological reasons why more boys than girls are born each year: around 105 boys per 100 girls. But in countries with a strong son preference, the sex ratio is even more skewed.
Unlike nuclear DNA, which comes from both parents, mitochondrial DNA comes only from the mother.
"Our research, on a much larger sample of babies than Christenfeld and Hill's, shows that some babies resemble their father more, some babies resemble their mother more, and most babies resemble both parents to about the same extent," says Paola Bressan, a psychologist at the University of Padova in Italy who co- ...
Your chances of conceiving a girl or a boy are about 50:50, like the flip of a coin.
And while it is true that you get half of your genes from each parent, the genes from your father are more dominant, especially when it comes to your health.
The genetics of height
If they are tall or short, then your own height is said to end up somewhere based on the average heights between your two parents. Genes aren't the sole predictor of a person's height. In some instances, a child might be much taller than their parents and other relatives.
One popular myth is that hair loss in men is passed down from the mother's side of the family while hair loss in women is passed down from the father's side; however, the truth is that the genes for hair loss and hair loss itself are actually passed down from both sides of the family.
Women around the world report higher levels of life satisfaction than men, but at the same time report more daily stress. And while this finding holds across countries on average, it does not hold in countries where gender rights are compromised, as in much of the Middle East and sub-Saharan Africa.
Yet women continue to live longer than men, suggesting the biological differences also have a role. According to the U.S. Centers for Disease Control, the average American man will live to age 76, while the average woman in America will live to age 81.
Male births were much more likely to require the use of oxytocin, a hormone which stimulates contractions. "Of the women carrying male infants, 70 per cent of them had completely normal deliveries, compared to 76 per cent of females."
The least common birthday is leap day, or February 29. But because the day only occurs once every four years, it's obvious it would yield the least amount of birthdays. The rarest birthday of the 365 annual calendar days is Christmas day, Dec. 25.
A new study has revealed that people born in April are the sexiest - and having a birthday in April myself, I'm obviously completely sold on the theory…
They found that babies conceived in summer months (June-August) were almost a third of an ounce (8 grams) heavier than babies born in other months. Together, the duo compared more than 1.4 siblings born to 647,050 mothers in New York City, New Jersey and Pennsylvania.