Timing of sex gender predictor

The proportions of X and Y chromosome bearing sperms in human semen are equal, but more boys than girls are born. Male embryos and fetuses have a greater risk of attrition in utero than their female counterparts, and therefore male excess is likely to be still larger at the time of conception. It remains unexplained, however, what is responsible, presumably at some point between insemination and conception, for the greater probability of Y bearing sperms fusing with the ovum. One hypothesis relates to experiments showing that Y bearing sperms swim faster than X bearing sperms in viscous fluids.
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Time to pregnancy and sex of offspring: cohort study

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Time to pregnancy and sex of offspring: cohort study

Many parents swear by at-home methods of gender selection. But can you really sway the odds? Ellen Durston, a newspaper reporter in Chicago, always wanted her first child to be female. Durston came across a technique pioneered 30 years ago by the late obstetrics researcher Landrum Shettles, M. Would Zoe have been Zachary if the couple had left it to chance? Quite possibly, by Durston's reckoning: "I'm convinced that the Shettles method is why I had a girl. The proud parents of three boys, ages 7, 6, and 2, the couple "wanted a fourth child, and wondered if there was any way to slant the odds in favor of having a girl—to have the experience of raising a daughter," says Jean.
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Shettles method

Boy or girl? Here's everything you need to know about when you can find out the gender of your baby through ultrasound. This is one of the most common questions doctors get from parents-to-be. The position of the baby during the ultrasound is key, and if your baby's curled up or facing the wrong way, you may have to wait until your next appointment. For obvious reasons, it's usually easier to see if your baby is a boy.
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Use these calculators, quizzes and tools when you find out you are pregnant! The ancient Mayans focused on math and astronomy, and it was at the center of their culture. Predicting the sex of unborn babies has been practiced since before these ancient times.
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