Реально ли "спрогнозировать" пол будущего ребенка ? Где-то слышала, что можно, в интернете не могу поискать, дико тормозит wi-fi.

по идее я слышала, что надо смотреть когда у родителей кровь поменялась... Система выглядит так: у мужчины кровь обнавляется каждые 4 года, у женщины, каждые 3 года, при этом надо учесть операции, кровопотери, роды. У кого на момент зачатия кровь моложе, такого пола ребенок и будет =) вот у кого из знакомых не считали, все сходилось =) только вот говорят есть нюанс: у женщин первые 1,5 года новая кровь активна, вторые 1,5 года пассивна, у мужчины также , только по 2 года, так вот, если например у женщины кровь моложе, но она находится на пассивной стадии, а у мужчины в это врмя активная фаза, то будет мальчик, если же оба пассивные или активные, то смотреть чья кровь моложе.

    
Choosing your baby's sex: What the scientists say
by Suzanne Leigh
Reviewed by the BabyCenter Medical Advisory Board
Last updated: June 2005
    
Highlights
Can we choose the sex of our child?
Overview: High-tech sex-selection techniques
Overview: At home techniques
The bottom line: What do the experts say?

Can we choose the sex of our child?

Yes, choosing the sex of your child is technically possible thanks to advances in fertility treatments that allow doctors to create or identify embryos of a certain sex. But today's sex-selection options aren't equally effective, affordable, or available.

The most accurate sex-selection methods are usually the most expensive (tens of thousands of dollars), often involving invasive infertility treatments and fertility drugs with side effects. If you're serious about trying one of these techniques, you'll have to meet strict eligibility requirements, too. In some cases you won't be eligible unless you're married and already have at least one child of the sex opposite from the one you're trying for. Some clinics also have age limits or require you to take hormone tests to prove you're not approaching menopause.

And keep in mind that Mother Nature has already tipped the odds a bit in favor of boys in the sex-selection game. According to data released in 2004 from the National Center for Health Statistics, approximately 1,050 boys are born for every 1,000 girls.

Read on for more information on how today's sex-selection methods work, whether you're eligible to try them, and how much they cost.
Overview: High-tech sex-selection techniques

The following gender-selection methods draw from two existing infertility treatments: in vitro fertilization (IVF) and artificial insemination (AI). IVF starts with a round of fertility drugs to stimulate your ovaries to produce several eggs for fertilization, instead of the single egg you normally release each month. Fertility drugs may also be used for AI. For AI, also known as intrauterine insemination (IUI), your doctor uses a catheter to insert a concentrated sperm sample directly into your uterus.

For IVF, fertilization occurs outside your body (in vitro means literally in glass). Your doctor gives you an anesthetic and removes your eggs from your ovaries by inserting a needle through your vaginal wall. Your eggs are then fertilized with sperm in a petri dish. Two to five days later your doctor places the fertilized eggs — now embryos — in your uterus by inserting a thin catheter through your cervix. The number of embryos inserted depends on your age, the quality of the embryos, and your reproductive history. As a general rule, if you're under 35 and the embryos look healthy, no more than two are transferred.





Choosing the Sex of Your Child
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Several options are available for choosing the sex of your child, but none are guaranteed.

By Dulce Zamora
WebMD Feature

Reviewed By Brunilda Nazario

Besides slipping the stork some extra cash, would-be parents have a number of options for choosing the sex of their child. The methods range from the natural (such as using particular positions during intercourse) to the high-tech (such as sorting sperm).

Couples have a 50/50 chance of conceiving a boy or a girl through plain old-fashioned intercourse. Yet there are some people who might want to stack the odds in their favor, either for cultural reasons, for dreams of raising a son or a daughter, or to balance out their families. Others do it to prevent their offspring from inheriting sex-linked genetic diseases.

Whatever the reason, health experts worry that some parents will place unrealistic hopes on a sex-determination technique and become disappointed whether or not they succeed. The method could either fail to produce a baby of the desired sex, or the right-gendered kid could grow up with traits that contradict with parental expectations. In this case, ethicists worry about the welfare of the child.

In addition, no preconception approach is foolproof, according to an ethics committee report in the May 2001 issue of Fertility and Sterility. Some popular strategies reportedly even fall under the category of foolery.

Of course, this list may not necessarily include your great grandmother's "tried and true" formula for choosing the baby's sex. Some doctors just chuckle at such schemes and say that as long as the advice doesn't hurt mom or baby, then there may be no harm in trying.

Natural Methods for Choosing the Sex of Your Child

The Shettles method is arguably the most well-known natural strategy for choosing the sex of your child. Developed three decades ago by Landrum B. Shettles, MD, PhD, the plan involves timing intercourse to a woman's cycle and assuming certain sexual positions.

In his book How to Choose the Sex of Your Baby, Shettles explains that the male (Y) sperm is smaller, faster, and more short-lived than the female (X) sperm. Because of this, it is better for boy-desiring couples to have sex closest to the time when a woman's egg is released (ovulation). This way, the speedy male sperm could get to the egg sooner than the female one.

The Y chromosome apparently also enjoys an advantage over its counterpart when the sperm is discharged as close as possible to the opening of the cervix. This is achieved through rear entry intercourse (man enters woman from behind).

Parents desiring a girl, on the other hand, are encouraged to have sex in the missionary position (face to face, man on top) about two to four days before ovulation so that by the time the egg comes, only the heartier, more resilient X sperm will remain in the woman's reproductive tract.

The Shettles method has reportedly been effective at least 75% of the time, with the rate slightly lower for girls than for boys. Pat Buie, a registered nurse from Canada, incorporated Shettles' method into her sex selection plan -- described in her book Choose the Sex of Your Baby Naturally -- and claims to have a 95% success rate.

Many fertility experts question the value of natural sex selection strategies such as the Shettles method.

"There's no real evidence to show that they work," says Sandra Ann Carson, MD, president of the American Society for Reproductive Medicine, noting that such techniques are as effective as random sex in producing a baby of the preferred sex.

J. Martin Young, MD, a pediatrician in private practice in Amarillo, Texas, reviewed medical literature on sex determination and found that the Shettles method fared worse than random sex, with a 39% success rate in choosing the sex of your child.

Shettles' ideas seem to make sense, but they're a little too simplistic and not based on scientific research, says Young, who authored two books on the subject. In How to Have a Boy and How to Have a Girl, he describes a strategy that opposes Shettles'.

"If you would like to have a female, you would schedule intercourse to be as close to the time of ovulation as possible," says Young. "If you would like to have a male child, you would have intercourse a number of days before to try to increase the probability."

The success rate for this strategy of choosing the sex of your child, says Young, can be as high as two chances in three (about 67%), if done properly.

The High-Tech Road

The odds of choosing the sex of your child may be even better with the help of technology. According to the fertility experts contacted by WebMD, MicroSort -- a method that involves separating the male sperm from the female -- is the current gold standard.

"The only effective method that I feel would be useful for sex selection is the MicroSort technique," says William Gibbons, MD, director of the EVMS Jones Institute for Reproductive Medicine.

Carson agrees. "I think sperm sorting is probably the most viable method that we have right now, but it's probably most effective when it's used in combination with in vitro fertilization."

MicroSort, which is licensed by the Genetics and IVF Institute in Fairfax, Va., is undergoing an FDA clinical trial. The technique involves separating X- and Y-bearing sperm by using laser light, dye, and a machine called a flow cytometer. Once the sperm are divided, the specimens are inserted back into the woman through artificial means, such as in vitro fertilization.

A news release issued in October 2002 from the Genetics and IVF Institute reports that MicroSort has a 91% success rate among couples wanting girls, and a 73% rate for those wanting boys.

MicroSort, however, isn't the only high-tech method for choosing the sex of your child. Other more controversial strategies include preimplantation genetic diagnosis (PGD), and chorionic villus sampling (CVS) -- both of which are used to detect medical illnesses but can also be used to distinguish sex.

To determine sex, PGD involves examining an embryo taken from the uterus and replacing only the embryo of the desired sex. In CVS, chromosomes of the fetus are analyzed in early pregnancy. There are reports that some people who find out they have an unwanted gender through this technique end up asking for an abortion.

The American Society for Reproductive Medicine recommends neither PGD nor CVS as a sex selection method for couples looking to balance the gender ratio in their families.

Published May 5, 2003.

nde..vot internet tebe tochno skazhet kakoj u kto u vas budet rebenok..

По законом генетики, каждое зачатие дает шанс в размере 50% зачать мальчика, и те же 50% зачать девочку. Но за очень большие деньги, можно изменить пол плода искусственно.

Миф, полагаю. Разве что с помощью генной инженерии. Думаю, нужно это запретить.

Да, если ты 3 раза пукнишь будет девочка, если 7 - мальчик.