The Whelan Method of gender selection is virtually the opposite of the Shettles Method. A woman named Elizabeth Whelan, Sc.D., published a book, Boy or Girl: You Can Pick the Sex of Your Child, in 1977 based on the theory that biochemical changes in a woman’s body may favor the Y-bearing (boy producing) sperm occur earlier in a woman’s cycle.
The Whelan Method recommends:
- To conceive a boy, you should have sex about four to six days before ovulation (before your basal body temperature goes up).
- To conceive a girl, you should have sex two to three days before ovulation.
Critics of this method say that having sex four to six days before ovulation for a boy baby may be too early to conceive a child at all.
Another method that is contrary to the Shettles Method is the 0+12 Method to conceive a girl, which advises having sex 12 hours after ovulation to conceive a girl. The method was developed by an Australian woman after examining a 1984 New Zealand study — A prospective study of the preselection of the sex of offspring by timing intercourse relative to ovulation — that was carried out to test the Shettles theory.
The New Zealand study was conducted to see whether a baby’s gender can be determined by timing intercourse relative to ovulation. It refuted the Shettles method because it concluded that most conceptions that occurred three to five days before ovulation were boys, not girls.