In the past, it was thought that. - Males developed on the right side of the uterus and females on the left (5th century B.C.) - An orgasm by the woman before the man selected for male offspring (Talmud, Leviticus 12:2) - The child’s sex was the same as the sex of the most active partner during the procreative process (Aristotle) - Copulation with the heads of the couples pointed North favored the birth of a male child.
The following methods are the more current theories regarding gender selection while trying to conceive.
The Shettles Method
The Shettles, by Dr. Landrum Shettles and David Rorvik, authors of How to choose the sex of your baby, is the method most used and most effective. According to this method Y-chromosomes (for boys) move faster but don't last as long as X-chromosomes (for girls), Dr Shettles says it makes sense to have sex as close as possible to ovulation if a boy is what you want. If you try to conceive two to four days before you ovulate, you'll most likely have a girl.
The Whelan Method
Elizabeth Whelan, Sc.D. author of Boy or Girl. doesn't agree with the Shettles
method and suggests the opposite. Whelan says if you want a boy, have intercourse four to six days before your basal body temperature goes up.
The Ericsson Method
In 1975, Ronald J. Ericsson, Ph.D. began clinical studies to determine whether such enriched sperm samples would result in offspring of a desired gender. Today the Ericsson method is used in approximately half of the centers in the U.S. Dr Ericsson devised methods by which X and Y sperm can be separated through filtering processes. This sperm sample is used for insemination when ovulation is anticipated. The enriched sperm sample is then available to fertilize the egg.
The Billings Method
A daily record of observations made at the vulva is essential for the Billings Ovulation Method. The recording is made in the evening of the most fertile characteristics noticed throughout the day. The first record, which is begun immediately, is usually of 2 - 4 weeks duration and is made without any genital contact so that the observations will not be confused by any secretions due to intercourse or contact. Your chart provides information for your husband as well, and it helps open the door for communication and decisions during these times.