Shettles method

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The Shettles Method , also Shettles-Billings Method , is a method for influencing the sex of the person during conception .

properties

The sperm with the Y chromosome are faster but less resistant than the sperm with the X chromosome . In addition, the acidic environment is unfavorable for sperm with the Y chromosome, this assumption makes it easier to father a girl. The Shettles Method uses precisely these two factors.

When a couple tries to father a child using the various methods described in this book, it can have an impact on their likelihood of fathering a boy or a girl. Proponents of this method claim that its effectiveness varies between 75% and 90%, but the experts have doubts, e.g. For example, in a 1995 article, "The Time of Intercourse in Relation to the Effects of Ovulation on the Chances of Conceiving, Flowering Pregnancy, and the Gender of the Child," The New England Journal of Medicine notes that "in practice, the time of intercourse in relation to ovulation does not affect the sex of the child ”. In the same journal, the New England Journal of Medicine, however, more extensive research has been carried out on the subject to date (1979), which indicates, “[our] studies ... show that fertilization occurs on different days of the menstrual cycle affects the sex of the baby ”. Opinions as varied as even in the same journal show that more study is needed to confirm that timing of conception affects the determination of the child's sex.

In a publication by the BMJ from 2006, an attempt was made to clarify the matter, "so far it has not been possible in the research to show the morphological difference between X and Y sperm" which would disqualify the Shettles method. However, more studies are needed.

history

The Shettles Method was developed by Dr. Landrum B. Shettles, a pioneer in the field of in vitro fertilization . Dr. Shettles invented this method in 1960 and published it in the book How To Choose Your Baby's Gender, which he wrote with David Rorvik. The book was first published in 1971 and appeared in several editions.

See also

Individual evidence

  1. ↑ Shettles, Landrum B .; David M. Rorvik, How to Choose the Sex of Your Baby: Fully revised and updated . 2006, p. 0-256 .
  2. ^ AJ Wilcox, CR Weinberg, DD Baird: Timing of sexual intercourse in relation to ovulation. Effects on the probability of conception, survival of the pregnancy, and sex of the baby. In: The New England Journal of Medicine . Volume 333, Number 23, December 1995, pp. 1517-1521, doi : 10.1056 / NEJM199512073332301 , PMID 7477165 .
  3. ^ Susan Harlap: Gender of Infants Conceived on Different Days of the Menstrual Cycle. In: New England Journal of Medicine. 300, 1979, p. 1445, doi : 10.1056 / NEJM197906283002601 .
  4. ↑ VJ Grant: misinformation Entrenched about X and Y sperm. In: BMJ. Volume 332, number 7546, April 2006, p. 916, doi : 10.1136 / bmj.332.7546.916-b , PMID 16613983 , PMC 1440662 (free full text).
  5. ↑ AM Hossain, S. Barik, PM Kulkarni: Lack of significant morphological differences between human X and Y spermatozoa and their precursor cells (spermatids) exposed to different prehybridization treatments. In: Journal of andrology. Volume 22, Number 1, 2001 Jan-Feb, pp. 119-123, PMID 11191075 .