The interpretation of the natural and biological alternating polarity cycle of the ovum membrane, which selects the sperm containing the gender determining Y or X chromosome. The Selnas Method identifies the days during which the ovum membrane has a negative or positive polarity which selects the sperm containing the Y (boy) or X (girl) gender determining chromosome. The Selnas Conception Chart allows the mother the choice to conceive on the days that nature has designated for a boy or girl.
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