Very often, before becoming married couplesproblem of child sex selection. Some of them wanted a girl, others - a boy. In some cases, the floor plan is medically necessary, since there are genetic diseases transmitted or only male or only female line. Selecting the sex of the child in this situation it is a healthy development for a lifetime.

Gender is determined by the child's set of chromosomes of malegerm cell. As they say in such cases, grandmother, what goes around, comes around! :) In male germ cells contain as X, and Y chromosomes. That's Y chromosomes determine the sex of a child.

The female egg cell contained only Xchromosome, so the baby's sex depends on the woman! If oplodotvoyaetsya female egg by sperm containing the Y chromosome in the set, it's a boy.

If the sperm do not have a Y chromosome, then a girl. The annual birth rate of girls and boys in a proportion of about the same.

There are many hypotheses on the future sex of the child.

One of them: the time of ovulation.
The scientists found that sperm,Y chromosome containing move faster than sperm cells containing only the X chromosome. Therefore, it is believed that if ovulation moment coincides with the moment of sexual intimacy, then the probability of the birth of a boy is much higher than the probability of the birth of girls.

Another hypothesis: the intensity of the sexual relations
It is believed that the high frequency of sexual actsIt contributes to the birth of the boys, as it increases the number of orgasms in women. And the orgasm, in turn, enhances uterine contractions, accelerating the movement of sperm with Y chromosome.

Hypothesis: a special diet
Теоретически учеными было установлено, что натрий и калий способствуют сперматозоиду, несущему Y хромосому, а кальций и магний стимулируют образование женского зародыша. Разработаны особые диеты, соблюдая которые можно зачать, по желанию, мальчика или девочку. Однако этот метод далеко не всегда себя оправдывает.

Hypothesis: the selection of sperm
This is perhaps one of the most promising methodsto conceive a baby of a particular sex. It is based on the selection of sperm cells containing a specific set of chromosomes: a Y chromosome - to conceive a boy, and only X chromosomes - to conceive a girl. But this method is still under development.

And the last thing I would like to mention - it is the ethical side of the issue. As far as the right to take into account only the desire of parents, or is it necessary, and medical evidence?