1, the best reproductive age for women
Over the age of 45, fertility has dropped sharply.
From the perspective of obstetrics and gynecology, women between the ages of 18-45 are regarded as women of childbearing age. In fact, women have the ability to conceive after menarche, and it is not uncommon for women to give birth after the age of 45. However, women before 18 years old and after 45 years old have irregular ovulation or poor egg development, and the probability of pregnancy is low. In fact, fertility will gradually decrease with age. Studies have shown that if women of childbearing age do not take contraceptive measures, about 57% will get pregnant after living together for 3 months; Living together for 6 months, about 70% pregnant; 1 year 85%, 2 years 93%.
There is no doubt that age is one of the important factors affecting fertility and has nothing to do with race.
Some scholars have studied a tribe living in the border area between the United States and Canada. Contraception is forbidden there. Of the 209 women surveyed, only 5 have never given birth; Among the women who have given birth, 1 1% are infertile after the age of 34; At the age of 40, 33% is infertile; After the age of 44, 87% is infertile.
What is the result if the frequency of sexual intercourse is excluded from pregnancy? Some French scholars have specially studied the pregnancy after artificial insemination. They found that the pregnancy rate was about 74% before 3 1 year, 6 1.5% after 3 1-35 years, and 53.6% after 35 years. It can be seen that female fertility declines with age, especially after 40 years old. This is not only affected by the frequency of sexual intercourse, but also by physiological and endocrine changes.
Cecilia Paper, a senior researcher in the Department of Public Health of Oxford University, is an expert in reproduction. She warned women that once they were over 35, their fertility would decline. Therefore, she advises women to have their first child before the age of 30, so that in case of problems, there is still time and remedies.
25-29 years old is the best childbearing age.
So when is the best childbearing age? According to the research of obstetrics physiology, eugenics and population control, the most suitable childbearing age for women is 25-29 years old. Clinical practice has proved that at this age, women have the strongest fertility, the best uterine contractility and less chance of dystocia. If the maternal age is too young, such as 20 years old, it is easy to be complicated with pregnancy-induced hypertension syndrome and premature delivery. And it may also lead to dystocia due to pelvic hypoplasia; When the maternal age is too large, especially over 35 years old, the possibility of abnormal egg cells increases, so the incidence of fetal malformation increases. Studies have shown that at the age of 25-29, the incidence of congenital stupid infants is only11500; 30-34 years old is1/900; 35-39 years old rose to1/300; Over 45 years old, reaching 1/40. In addition, mothers are too old and often have other chromosomal abnormalities and physical and mental defects.
The father's age also affects fertility.
For the man, the reproductive age is also related to the baby's health. Generally, men are energetic, healthy and have the highest sperm quality at the age of 25-35. Someone has investigated 1 150 children in 302 families. Statistics show that the average age of the father of the person with the best intelligence and physical strength is 29 years old at birth. This is because, with the increase of age, chromosome diseases originating from men have also increased. According to statistics, the extra chromosome 2 1 in three body 2 1 (congenital idiocy) is about 1/4 from the father. Another data shows that the neonatal mortality rate increases with the increase of father's age. If the father is over 40 years old, the number of children's deformities will increase by 1 times.
In modern society, many reasons why men and women delay having children when they reach school age are because they are afraid that their just-started careers will be affected. Actually, having a baby is not complicated. For women, pregnancy and childbirth are a physiological process, not a disease, and they can undertake some work within their power. We advise you to cherish the childbearing age, give birth as soon as possible without health concerns, and think more about future generations while rushing for the future.
2, the best age for male fertility.
◆ Excessive exercise, overnutrition, chronic diseases and long-term non-ejaculation will all affect the quality of sperm.
◆ The reproductive age of women is not more than 30 years old and that of men is not more than 35 years old.
After the implementation of the "two-child policy", people pay more attention to the fertility of elderly women. In fact, the fertility disorder of older men is equally worrying. A few days ago, in a special lecture on giving birth to two children held by the Reproductive Center of Sun Yat-sen Memorial Hospital of Sun Yat-sen University, experts said that the reproductive age of women should not exceed 30 years, and that of men should not exceed 35 years. Studies have shown that male sperm quality reaches its peak at the age of 30, and then it can last for 5 years. The offspring of men aged 30-35 are the best. In addition, excessive exercise, overnutrition, chronic diseases and long-term non-ejaculation will all affect the quality of sperm. Experts especially remind that elderly men should maintain a normal frequency of sexual life and not deliberately abstain from sex, because abstinence time affects the quantity and quality of sperm. After more than 7 days, sperm quality gradually decreased.
Research: The offspring of men aged 30-35 are the best.
Shen Changli, deputy director of urology at Sun Yat-sen Memorial Hospital of Sun Yat-sen University, said that after the implementation of the "two-child policy", the official estimate is that 3 million children will be born every year, but at present it is only 1 10,000, less than half of the official estimate. "In addition to socio-economic factors, fertility difficulties are also the reasons." He said that at present, most couples who are going to have two children are between the ages of 35 and 50. Older women are preparing to have two children, with low ovarian response rate, old infertility and low fertility success rate. Older men with two children are also facing the problem of declining fertility rate.
Shen Changli believes that the childbearing age of women is between 23 and 30 years old, while that of men is between 25 and 35 years old. The reproductive age of women should not exceed 30, and that of men should not exceed 35. The best age combination for male and female children should be that the former is about 7 years older than the latter.
"On the issue of fertility, scientists focus on heredity." Shen Changli said that the research results of French geneticist Maurice showed that the sperm quality of men reached its peak at the age of 30, and then it could last for five years. The offspring born to men aged 30-35 are the best.