It is important to understand how conception actually works before you plan your baby’s gender. Female eggs consist of X chromosomes and male sperm of either Y or X Chromosomes. The man’s sperm chromosome of either X or Y will determine if it’s a boy or a girl. X chrome sperm produce girls and Y chrome sperm, boys. The trick how to conceiving a baby boy or girl is to create a favorable environment for either chromosome to reach the egg for fertilization.