Book excerpt: More Than 1.5 Million Copies Sold! Now Revised and Updated to Include the Latest Scientific Information and Even More Success Stories For almost forty years, How to Choose the Sex of Your Baby has been the standard reference for couples trying to increase their chances of having the son or daughter they hope for. In this new edition of their classic book, Dr. Shettles and David Rorvik provide authoritative scientific studies and compelling anecdotal evidence demonstrating that the Shettles method continues to produce results unmatched by any other method. Dozens of testimonials confirm its ease of use and rate of success. How to Choose the Sex of Your Baby explains the simple, at-home, noninvasive Shettles method and presents detailed steps to take to conceive a child of a specific gender. The properly applied Shettles method gives couples a 75 percent or better chance of having a child of the desired sex. Some researchers have reported success rates of up to 90 percent!