Girl Sperm
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Girl Sperm
What Happens to Sperm Once They're Inside a Woman?
New York Is NOT Banning Whipped Cream
New York Is NOT Banning Whipped Cream
A sperm’s journey from vagina to egg is only 15 centimeters long, but it’s a race with attrition.
There are approximately 200 million sperm in each human ejaculation, but only about 2 million sperm make it into the cervix. The rest are killed by the acidic fluids inside the vagina or lost in “ flowback ”—which is exactly what it sounds like.
Out of the approximately 2 million sperm entering the cervix, only about 1 million make it into the uterus. The rest are stopped by gooey mucus, or swim into dead-end channels inside the walls of the cervix.
Out of the approximately 1 million sperm that enter the uterus, only about 10,000 make it to the top of the organ. The rest are attacked and absorbed by white blood cells, which start to appear in force as soon as sperm enter their defensive perimeter.
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Out of the approximately 10,000 sperm cells that make it to the far end of the uterus, only about 5,000 turn in the right direction. The rest head toward the other oviduct, and unless both the woman’s ovaries have released eggs simultaneously (a rare event), those sperm are out of luck.
Out of the approximately 5,000 sperm that enter the uterotubal junction —a twisty space connecting the uterus and the oviduct—only about 1000 enter the Fallopian tube. The rest get caught in the mucus lining the junction.
Out of the approximately 1,000 sperm that enter the Fallopian tube, only about 200 reach the egg. The rest get attached to the lining of the oviduct, or just give out and die.
Out of the approximately 200 sperm that reach the egg, only 1 enters the egg to fertilize it. The rest are pushed away by the zona reaction , which makes the fertilized egg impermeable to additional sperm. Those last extra sperm? Yet more fodder for a woman’s immune system.
Top image adapted from LadyofHats via Wikimedia | CC0 1.0 ; Uterus from Johannes Sobotta, 1906; Fertilization from Blausen.com staff . Wikiversity Journal of Medicine | CC BY 3.0
Contact the author at diane@io9.com .
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In a study of 87 women, 4 or more fertile days were identified in 80% of cycles (2012).
www.acog.org/-/media/Womens-Health/Multiples-When-Its-Twins-Triplets-or-More.pdf
Hoeskstra C et al. Hum Repro Update (2008): 14; 37-47
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Whether your baby is a boy or a girl is determined by the chromosome it inherits from its father. The egg from its mother always contains an X (female) chromosome, but the sperm contains either a female or a Y (male) chromosome. When the egg is fertilized the chromosomes come together and if they are XY a baby boy is conceived and if they are XX a baby girl is conceived.
When we look at the statistics the chances of having a boy or a girl are almost the same and there’s no medical evidence to suggest we can influence this.
You may, however, have heard about the ‘Shettles Method’. In the 1970s Dr Shettles found that female and male sperm had different characteristics. He believed that identifying these differences may help couples to try to conceive a boy or a girl. 1
It’s all about a race to the egg…
Shettles found male sperm to be smaller, would swim faster and have a shorter life span than the female sperm. He believed that if a couple had sex around the time of ovulation the male sperm would be more likely to reach the egg before the female sperm. If the egg fertilized the couple were more likely to conceive a baby boy. Female sperm were found to be slower, fitter and would live longer than male sperm so making love earlier in the fertile window meant they would still be alive to fertilize the egg, and more likely to conceive a baby girl.
Whilst it’s a fascinating theory, studies since then have shown that the timing of sex in relation to ovulation doesn’t actually influence whether you conceive a boy or a girl. 2
Whether you are interested in conceiving a boy or a girl, it’s still important to remember that there are only a few days in every cycle when you can get pregnant. Using Clearblue Digital Ovulation Tests or Visual Ovulation Test helps you identify your 2 most fertile days, so you can be confident you are trying at the right time.
And the Clearblue Advanced Ovulation Test typically identifies 4 or more fertile days giving you more opportunities to get pregnant. 3
Shettles also suggested that the sexual position at the time of the father’s orgasm may help the chances of conceiving a boy or girl. Deep penetration, for example doggy style, means the male sperm that can swim faster start their race closer to the cervix and are more likely to reach the egg first, resulting in a boy. To try and conceive a girl, Shettles suggested avoiding deep penetration, favouring the missionary position.
It’s another interesting theory, but again there’s nothing to support this idea. Dr Michael Thomas MD (fertility specialist) actually advises that there are no methods to affect the sex of your child, including sexual position.
Cervical mucus is most sperm-friendly at the time of ovulation, when it is more alkaline. Prior to ovulation the mucus is more acidic which is not ideal for sperm and only the fittest can survive. Shettles suggested that making the vagina more acidic means the fitter female sperm are more likely to survive and a baby girl is conceived. A more alkaline environment is better for the faster male sperm and a baby boy is conceived. You could try different foods to influence your vaginal pH, but we haven’t been able to find any evidence that this works.
Twins happen when more than one baby develops in the womb. There are 2 types of twins: non-identical (when more than one egg is fertilized) and identical (when one single fertilized egg splits in early pregnancy).
Twins have become more common over the past 20 years – largely due to the use of fertility treatments.
There is no way you can choose to have twins, but some factors can make it more likely to happen:
Understand more about ovulation: what it is, when it happens, its signs, how to track it…
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