But only one of these sperm will ultimately fertilize an egg. With so many sperm, it is statistically impossible to change the ratio of girl X chromosome to boy Y chromosome sperm. There are no diets, or exercises, or underwear, or acrobatic sex acts that can change that ONE sperm in ,, Parents throughout the centuries have tried all kinds of tricks to influence the natural ratio of X and Y chromosomes in sperm.
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It turns out there is some research suggesting that a couple has a slightly higher chance of conceiving a son or a daughter based on certain factors, like the season in which you got pregnant or whether you or your partner has a stressful job. Read on for more somewhat scientific and interesting baby gender signs. Keep in mind, much of the scientific evidence here is slight, and some of it is hotly debated by experts. But it's still fun to try to guess. Read on to see what the statistics say for you.
Or try our Chinese gender predictor. Note: We're using the word gender here because people often use it interchangeably when talking about their child's sex. However, the two are not the same. A child is generally assigned a sex at birth based on biological characteristics, such as their genitals.
But their sex designation may not match the gender identity based on feelings and behaviors that they assume later. One large study looking at data from 48 million births in the United States found that married couples are more likely to give birth to sons.
Another study of 86, parents showed that couples who were living together when they conceived were slightly more likely to have a boy. Just over half The study's authors had no theory on why living together resulted in more boys. If your relationship is still new and exciting, you're more likely to be having lots of sex — and frequent sex may give male sperm a slight advantage. Male sperm are lighter and have smaller heads and shorter tails. This allows them to swim more easily through the slightly less hospitable mucus in your vagina at the beginning and the end of your fertile window.
Some experts think that female sperm are more likely to reach the egg in the middle of your fertile period. So if you're having frequent sex, you have higher odds of having sex during both the start and end of your fertile window, when male sperm have a slight advantage. One study divided British women into groups according to their caloric intake.
Of the women who had the highest daily intake about 2, calories , 56 percent had boys. Of the women who had the lowest intake about 2, calories , only 45 percent had boys. Another study looked at 68 million births and found that women who gained more weight during pregnancy were more likely to be having boys. Male fetuses are more fragile and are statistically less likely to be conceived or survive pregnancy when food is in short supply.
Female sperm are more robust and baby girls are hardier early in pregnancy, so in leaner times they may be more able to survive. In some countries, more boys are conceived in the summer and more girls are conceived in winter. This may be because more viral and bacterial infections are around in the winter.
As male sperm and embryos are more fragile, they may be less able to withstand the mother's catching an infection than female embryos. Women carrying boys have a higher risk of developing gestational diabetes. Exactly why isn't clear, but it's possible that male fetuses interfere with cell functioning that affects glucose metabolism.
The older the dad and mom, the more likely female sperm are to fertilize the egg. This could be due to hormonal changes in the woman as she ages. And older men produce fewer male sperm. Or it could be that older couples are more likely to have sex in the middle of the fertile period, when female sperm may have the edge over male sperm. You're slightly more likely to have a baby girl if you have severe morning sickness hyperemesis gravidarum.
A review of 13 studies found that 55 per cent of babies born to women who'd had severe morning sickness were girls. This was compared to 49 percent in the control group who didn't suffer from it. Some experts think that this is due to high levels of the hormone estrogen, which is linked with morning sickness.
A study of Japanese births from to found that more girls were conceived during a particularly hot summer in , and again during an extremely cold winter in Other research has shown that warm temperatures appear linked to girl babies. And a global survey of birth data showed that more girls are born in the tropics the region around the equator than anywhere else in the world.
One theory is that weather extremes cause stress. In addition to the uncomfortable temperatures, very hot or cold places tend to have poor nutrition, high levels of pollutants, and insufficient or excessive sunlight. Such stress is especially hard on male fetuses, which are more fragile than female fetuses in the earliest months of pregnancy. Women working in mentally stressful jobs outside the home may be more likely to have a girl.
Are you dying for French fries and a hearty steak dinner? A Chinese Gender Chart was supposedly buried in a royal tomb more than years ago, but was recently discovered and is now used to determine the gender of an unborn child. To use the chart, find your age at the time of conception, and then follow across to the month the baby was conceived to find the predicted gender.
Not to be outdone by the Chinese, the Mayans came up with their own method for determining boy v. This test claims a pregnant woman can determine the gender of her baby by picking up a single key.
What if Mom grabs the key in the middle? Twins, of course! Warning: Do not try this test while driving! Many parents-to-be choose to learn the sex of their baby at the week anatomy ultrasound scan — assuming baby is in the right position. Those are the scientific terms, of course. Just remember: This method is not foolproof. Some folks say determining your baby's gender is as simple as glancing at your hands. Dry, cracked hands mean there's a boy on the way, while soft hands signal a little girl.
Although this method is certainly easy, we tend to think it's an indicator of something else — how badly you need to moisturize! Dark, neon-like urine supposedly equals boy, while dull, cloudy and light urine equals girl. Grab hold of your honkers and see which one feels bigger.
A larger left breast supposedly means boy; a larger right one a girl. Want to make this test more fun?
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