It has been observed that at the time of fertilization, the pH of the vagina
may play a role in the selection of X- or Y-bearing sperm and thereby affects
the sex of the offspring [37]. The pH of the vagina is moderately acidic
which varies from 3.8 to 4.5 [38]. Thus, studies have been done and patented,
wherein sperm cells were put in an environment having physiological pH and at
the same time contacting the sperm cells with at least one extra
subenvironment with differing pH to enrich the population of specific type of
sperm cells.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6755399/#ref39
据观察，在受精时，阴道的酸碱度
可能在选择含 X 或 Y 的精子中发挥作用，从而影响
后代的性别 [37]。阴道的酸碱度为中度酸性
从 3.8 到 4.5 [38] 不等。因此，已经完成研究并获得专利，
其中精细胞被置于具有生理 pH 值的环境中，并且在
同时与至少一个额外的精子细胞接触
具有不同 pH 值的亚环境以丰富特定类型的种群
精子细胞。
https://i.imgur.com/1goLAut.png
科学上，ph值对于x/y精子的生存有极大影响。
想问一下版上有两位以上只有同性别宝宝的爸妈的饮食习惯！
推文格式范例：
两男，父肉食，母素食。
三女，父素食，母肉食。
感谢大家回复～