The sex secret of having a boy or a girl
The formation of the fetus gender has relationship with sex though, but still can’t fully determined the sex of the fetus. However, there is still great possibility to improve the chances of choose.
In order to understand principle, let’s start from the characteristics of sperm. According to a study that the sperm X and sperm Y have different features. The head of the sperm X is bigger with large size, much slower than sperm Y. And sperm Y head is small and round, smaller size, move much quicker than sperm X. About the tolerance of acid and the penetration of cervical mucus, the sperm X is stronger, the life is longer. More seminal, more sperm Y, less seminal, less sperm Y. According to these characteristics, we can try to adjust the gender in sex.
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