Boy or girl?
Your baby’s sex is determined at the moment he or she is conceived. Of the 46 chromosomes that make up your baby’s genetic material, two chromosomes called sex chromosomes — one from your egg and one from your partner’s sperm — determine your baby’s sex. A woman’s egg contains only X sex chromosomes. A man’s sperm, however, may contain either an X or Y sex chromosome.
If, at the instant of fertilization, a sperm with an X sex chromosome meets your egg, which also has an X sex chromosome, your baby will be a girl (XX). If a sperm containing a Y sex chromosome joins up with your egg, your baby will be a boy (XY). It’s always the father’s genetic contribution that determines the sex of the baby.
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Posted in Pregnancy
