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There is no direct correlation between the birth of a son and the pH level in a woman's body. The gender of the fetus is determined by the sex chromosomes carried by male sperm. The acid-base constitution theory lacks scientific basis. Changes in the pH of the vaginal environment only affect sperm survival rate and cannot interfere with gender selection.

Male sperm are divided into two types: X chromosome and Y chromosome. The gender of the fetus depends on the type of sperm that combines with the egg during fertilization. X-chromosome sperm are more acid-resistant but swim slowly, while Y-chromosome sperm are more active in an alkaline environment but have a shorter survival time. The normal vaginal pH value is a weakly acidic environment of 3.8-4.5. Cervical mucus will temporarily become weakly alkaline during ovulation. This cyclic change is a natural physiological phenomenon. Attempting to change the pH of the vagina through diet or douching may disrupt the microecological balance and lead to gynecological diseases such as vaginitis.

There is a cognitive misunderstanding in the popular belief that alkaline food promotes the birth of boys. Although alkaline foods such as kelp and soda water may temporarily change the pH of urine, the human body has a precise acid-base regulation mechanism, and the blood pH value is always maintained in a stable range of 7.35-7.45. Excessive intake of alkaline foods may cause metabolic alkalosis, causing symptoms such as tetany and nausea. During pregnancy preparation, you should pay more attention to balanced nutrition. It is recommended to consume 300 grams of green leafy vegetables, 200 grams of high-quality protein every day, and supplement folic acid and vitamin E.

Maintaining a regular schedule and moderate exercise can help improve the quality of fertility. Couples preparing for pregnancy can do aerobic exercise three times a week to avoid exposure to high temperatures and radiation. If there are reproductive system diseases, they should be treated in time. Men can check the semen quality, and women need to pay attention to the ovulation cycle. Fetal gender is the result of natural selection. It is recommended to treat fertility with a scientific attitude and focus on maternal and infant health protection.