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The Shettles Method is a child conception idea that is reputed to help determine a baby's sex. It was developed by Landrum B. Shettles in the 1960s and was publicized in the book How to Choose the Sex of Your Baby, coauthored by Shettles and David Rorvik. The book was first published in 1971 and has been in print in various editions ever since.
Many parents want to conceive a baby girl naturally. There are many superstitions about how to have a girl, but experts explain parents can't really control it.
The World Health Organization considers the rhythm method to be a specific type of calendar-based method, and calendar-based methods to be only one form of fertility awareness. [2] More effective than calendar-based methods, systems of fertility awareness that track basal body temperature, cervical mucus, or both, are known as symptoms-based ...
The Calendar-Rhythm method is also considered a calendar-based method, though it is not well defined and has many different meanings to different people. Systems of fertility awareness may be referred to as fertility awareness–based methods; [5] the term Fertility Awareness Method (FAM) refers specifically to the system taught by Toni Weschler.
In 1994, the first British baby was born through gender selection Sophie-May Clark. Recently, a study published in 2006 indicated that mothers with toxoplasmosis have a significantly higher sex ratio of boys to girls. This has been discussed in connection with the manipulation hypothesis of parasites. [61]
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
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