If you’re looking for information on how to have a baby girl, you’ve likely heard all kinds of old wives’ tales for choosing the sex of your baby. These range from Chinese conception calendars, to chocolate and making love under a full moon. But did you know there are some sound scientific theories that might increase your odds of conceiving a girl? Dr. Landrum Shettles has made some inferences about the odds of conceiving a girl or a boy based on some simple observations about the differences between sperm carrying the X chromosome (“girl sperm”) and sperm carrying the Y chromosome (“boy sperm”). To learn how to use Dr. Shettles’ method for how to have a baby girl, read on.
Before we discuss how to have a baby girl, it’s helpful to get back to the basics of how a baby’s sex is determined. The sex of a baby is determined by which type of sperm cell reaches and fertilizes the mother’s egg first. A woman’s egg cell always contains an X chromosome, while a man’s sperm cell contains either an X or Y chromosome. If girl sperm fertilizes the egg, an XX chromosomal pattern results in the conception of a girl. If boy sperm fertilizes the egg, an XY pattern results in the conception of a boy.
Differences Between Girl and Boy Sperm
Dr. Shettles discovered that there are key differences between boy and girl sperm that can work to your advantage if you want to choose the sex of your baby. Boy sperm contains less genetic material than girl sperm, making it lightweight and fast, whereas girl sperm is slower, but survives longer in the female reproductive tract. According to Dr. Shettles, the conditions inside a woman’s body also affect sperm motility and survival. Acidic conditions favor the hardier girl sperm, whereas tipping the balance of a woman’s body chemistry toward alkaline will favor the weaker boy sperm. Finally, depth of penetration during intercourse affects whether girl or boy sperm is most likely to win the race. Girl sperm has a better chance at making it through the vaginal canal than boy sperm with shallow penetration, whereas boy sperm is favored with deep penetration.
Tipping the Odds
To conceive a girl, couples should have frequent intercourse from the time the woman’s period ends until 2.5 to 3 days before ovulation. Intercourse should be avoided from 2.5 days before to 3 days after ovulation, or else the chances of conceiving a boy increase. Timing intercourse to conceive a girl can be tricky, since couples will need to estimate ahead of time when ovulation will occur. This is best done based on past cycles, but is not foolproof since cycles vary among women and in the same woman from month to month. Timing intercourse to conceive a girl involves a fair amount of uncertainty. Timing is important because girl sperm are more likely to survive in the woman’s reproductive tract and be available to fertilize the egg when it is released from the ovary. Most of the boy sperm will have already died by the time the egg is released.
How to Have a Baby Girl
To increase the odds of having a baby girl, have intercourse with shallow penetration (i.e., the missionary position). The vaginal environment is more acidic as you move farther from the cervix toward the vaginal opening, and the less hardy boy sperm are more likely to die on the way through the vaginal canal. The tough girl sperm are more likely to make the long journey through the vaginal canal and reproductive tract to fertilize the egg.
To conceive a girl, the female partner should not have an orgasm. Orgasm causes secretion of alkaline substances that favor boy sperm, and rhythmic, muscular contractions propel boy sperm quickly through the reproductive tract, getting them to the egg quickly before they die off and are supplanted by girl sperm.
Important things to remember:
- Timing of intercourse is the most important factor in determining the sex of your child.
- While the theory behind the Shettles method for how to have a baby girl is sound, there is no conclusive proof that these methods work. If you conceive, you should be prepared to welcome a child of either sex.
Want to try for a boy instead? Click here to learn how to have a baby boy.