Formation of fetal sex and sex life has a certain relation, but still cannot completely control the sex of the fetus. However, improving opportunities to choose, it is possible.
To find out what the principles, we first talked to from the characteristics of the sperm. Study finds sperm sperm in x and y have different characteristics. Sperm x-head is large, larger, event slower than the y sperm, on acid tolerance of cervical mucus and sperm in penetrating a y, and live longer. Y sperm head is small and rounded, smaller size, faster than a sperm x move, but on acid tolerance and cervical mucus penetration force weak, life is short. Low percentage of sperm in the semen of less y, y high proportion of sperm in the semen of sperm. According to these characteristics, through measures on sex, you can try to regulate sex.
(1) selective cross-time: a boy who, in the ovulatory sexual intercourse (or insemination), that is, to remove the man, because sperm y more fragile and cannot wait for a long time like a sperm x and ovulation and the more recent, more cervical mucus thin, alkali, good for sperm y. Instead, health and women, should be further away from ovulation period, in which case more cervical mucus viscosity, acid, to the disadvantage of sperm y, relative to the sperm x tolerance.
(2) master orgasm: intercourse, to adjust orgasm. Some say: \"because your wife achieve orgasm, why hygiene boy\", which is informed. Because inside the vagina is acidic, when the woman reached orgasm, because basic cervical secretion of mucus. That is, women feel orgasm the more, more alkaline secretion, y sperm will be easier to survive. Conversely, if the woman has yet to reach orgasm ejaculation, due to contact of semen in the vaginal secretion of acid, some y-sperm loss of vitality, it is possible to increase the chances of female foeticide.
(3) controlling the sex life of the times: normal human sperm produced 30 million a day, sexual intercourse too frequently can reduce sperm, sperm y low percentage, interval extension of intercourse can sperm count increase, high proportion of the sperm y, so the boy, sex longer intervals, to improve the quality of semen and concentration. Birth to a girl, sex interval does not have to be limited.
(4) using diet to adjust the pH of the body: according to foreign medical survey data confirm that male semen is weak alkaline, wife boy, this is because sperm y in strong alkaline environment active; are weakly acidic, the girl, sperm x activity increased in the acidic reasons. Therefore, a boy, body fluids should be made to maintain a weak alkaline, alkaline food intake some more, such as fresh vegetables, fruits, etc. But those girls, should be slightly humoral acidification, daily eat acid foods, such as rice, fish, meat, eggs, and so on.
(5) pay attention to the sexual intercourse of shades: if ejaculation position light, the sperm reach the uterus of time longer; on the contrary, where ejaculation deep, sperm can arrive early uterine. So, if you want to a boy, semen into the vagina during intercourse be deep to help y sperm appear near the cervix, avoid it travel through the difficulties of cervical mucus; if the daughters, the semen into the vagina of shallow, intends to increase the y sperm long distances through difficult, x sperm ahead, preemptive and egg.
Several points above are not absolute, just a matter of how much opportunity, boy or girl should still take its course. For one of the spouses need to select the sex of ill people, can be used as reference, to increase the gender-specific opportunities of the fetus.
Transfers from the well child
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