How Sex Selection works

Each parent contributes half of a baby's genetic make up. The female or mother is genetically an XX, so she is only able to contribute an X to the future baby. The father of the baby is XY and can contribute either an X or a Y. This means that sperm is the deciding factor in how your baby's sex is determined.

Over 200 million sperm are ejaculated into the vagina during intercourse, a mixture of X and Y. Most likely only one will be the one to penetrate the ovum