1. Misunderstandings in the theory of acid-base constitution

·The body's acid-base balance is stable
The pH value of human blood is strictly maintained in the weakly alkaline range of 7.35-7.45. If it deviates from this value, it will cause acidosis or alkalescence, which will endanger life in severe cases. Although local pH levels such as urine and vaginal environment fluctuate, the body's pH status cannot be changed through diet or external intervention.
There was no significant difference in the vitality of sperm (including X and Y sperm) in the pH range of 4.5-8.0.
(X,Y)pH 4.5-8.0.Experiments have shown that even if sperm are treated with acidic or alkaline solutions, the probability of fertilization is still close to 50%.
The normal pH of the vagina is 3.8-4.5 (acidic), which inhibits the growth of harmful bacteria; the internal environment of the cervix is close to neutral (pH 7.0), and the fallopian tubes are weakly alkaline (pH 7.5-8.5).
pH3.8-4.5(),;(pH 7.0),(pH 7.5-8.5).Forcibly changing the vaginal pH will destroy the balance of flora and increase the risk of vaginitis, which is not conducive to pregnancy.

2. Scientific mechanism for giving birth to boys and girls

The gender of the fetus is determined by the sex chromosome carried by the father's sperm:
X Sperm + Egg (X) → XX (female)
Y sperm + egg (X) → XY (male)
At each fertilization, the probability of X and Y sperm combining with the egg is equal, and the probability of naturally conceiving male and female is 50%.

3. Risk of human intervention

·Diet and drugs are ineffective
Alkalinefoods (such as soda and vegetables) only affect the pH of urine and cannot change the pH of the reproductive tract or blood. Abuse of androgenic drugs may lead to virization of female fetuses or abnormal gonadal development of male fetuses.
Acidic flushing solution can destroy the vaginal lactic acid bacteria barrier and cause inflammation; alkaline flushing may induce hydrosalpinx and increase the risk of ectopic pregnancy.
Acidic cleaning solutions can damage the protective barrier of lactic acid bacteria in the vagina, leading to inflammation. Alkaline cleaning solutions may cause fluid accumulation in the fallopian tubes, thereby increasing the risk of ectopic pregnancies.
Only three generations of IVF (PGT technology) can screen the gender of embryos under medical indications (such as avoiding inheritance of hemophilia), but requires strict approval.
Only third-generation in vitro fertilization techniques (PGT technology) allow for the selection of embryo gender under medical circumstances, such as to prevent the transmission of hemophilia genes. However, such procedures require strict approval processes.

4. Scientific pregnancy preparation advice

·Balanced nutrition: Eat more protein, folic acid (green leafy greens), and iron (red meat) to avoid high sugar and fat.
· Regular schedule: Ensure adequate sleep, engage in moderate exercise, and minimize the impact of staying up late on the endocrine system.
· Regular check-ups: Complete TORCH screening before pregnancy, thyroid function tests, and screenings for infectious diseases.
· Psychological adjustment: Accept the randomness of having a boy or a girl, focus on the health of the embryo rather than gender.
:,,.It is recommended to follow the principle of scientific pregnancy preparation and take fetal health as the primary goal.