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Is gender really 50/50?

Published in Child Sex Determination 2 mins read

Yes, the chances of having a boy or a girl are approximately 50/50, according to most studies.

Understanding the 50/50 Ratio

The sex of a baby is determined by the sperm from the father. Sperm contain either an X or a Y chromosome. The mother always contributes an X chromosome.

  • Female: When an X chromosome sperm fertilizes the egg (X chromosome), the result is a female (XX).
  • Male: When a Y chromosome sperm fertilizes the egg (X chromosome), the result is a male (XY).

Because males produce and release sperm with an almost 1:1 ratio of X and Y chromosomes, the chances of each type of fertilization are close to even. Therefore, it’s highly probable that the chance of having a boy or a girl will be roughly 50/50.

Factors That Do Not Influence Sex Selection

It's crucial to understand that:

  • You cannot influence the sex of your baby. Despite many myths, there's no diet, position, or timing that can change the sperm's inherent chromosome ratio. The sperm is released at about a 50:50 chance to be a X or a Y chromosome, according to most research.

Summary of Gender Probability


Outcome Chromosome Combination Approximate Probability
Female XX 50%
Male XY 50%

The provided source suggests that while the sex of a baby may seem to be a matter of chance, the underlying biological process is fairly even, and this is why we have the 50/50 ratio of boy to girl babies.