What determines whether the baby is a boy or a girl?
When a human egg is fertilized with sperm, the sex of the baby is determined immediately. Sperms and egg~ contains “chromosomes”. There are two types of chromosomes – either an X or a Y. If the sperm contains a Y chromosome, the child will be male; if it contains only an X chromosome, the child will be female. The man’s sperm determines whether the baby is a boy or a girl. A female child would have XX chromosomes and male child would have XY chromosomes.