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Related Articles > Interview with a Fertility Doctor: Herbal Supplements for Fertility Can Timing of Intercourse Influence Gender Outcome? At conception, gender is determined by chromosome characteristics. The egg carries an X chromosome while the sperm can carry an X or a Y chromosome. If the sperm carrying an X chromosome fertilizes the egg, a girl will be conceived. If the sperm carrying a Y chromosome fertilizes the egg, a boy will be conceived. Studies indicate that the sperm with the X chromosome - or female chromosome - have a longer life span than the male sperm (with the Y chromosome). Yet the male sperm appear to have a higher motility. Sperm motility is measured in two ways: percentage of sperm exhibiting any kind of movement, and the quality of this movement, which is called the forward progression. Poor motility means the sperm have a difficult time swimming toward the egg. Though only theoretical, it is believed that if intercourse takes place closer to ovulation, then the probability is greater that the child will be male, due to the high motility (forward progression) and the decreased life span of the sperm. The sperm with the X chromosome - or female chromosome - have a longer life span than the male sperm, but exhibit decreased motility. Therefore, intercourse that takes place earlier may provide increased probability of a girl. Again, this is theoretical, but there are several clinics that have claimed to master this system. To learn more about gender selection and timing intercourse, click here.
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