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The only sure way to have a baby boy, according to In-Gender.com, is to use the high-tech method of preimplantation genetic diagnosis. This method involves fertilizing the egg with sperm in a laboratory, then testing the resulting embryos to determine their gender. Any male embryos are then implanted in the woman's uterus. This method is expensive, and some say it is unethical. There are other, less-extreme methods on conceiving a baby boy, but none of them are fail-proof.