When is sex determined during pregnecy

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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.

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Sexual differentiation in humans is the process of development of sex differences in humans. It is defined as the development of phenotypic structures consequent to the action of hormones produced following gonadal determination. The development of sexual differences begins with the XY sex-determination system that is present in humans, and complex mechanisms are responsible for the development of the phenotypic differences between male and female humans from an undifferentiated zygote.

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Throughout history, many parents didn't want to wait until the actual birth to find out. They'd wave crystals over the mother or consult the stars. Now, of course, there are much more accurate ways to determine gender before a baby is born.

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Embryos with XY chromosomes become boys, and those with XX chromosomes become girls. That means that all our sex organs come from the same foundations: The testes in men are equivalent to labia and ovaries in women, and the penis is the equivalent of the clitoris. At around week 7the Y chromosome signals for the start of testosterone production, and male genitalia begin to develop. Between 16 and 20 weeks, testosterone levels fall until they reach the range found in early puberty by about 24 weeks.

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The tests have been available to consumers in drugstore chains and online for a few years, but their use has been limited, partly because their accuracy was unclear. One company, which guaranteed European doctors now routinely use the tests to help expectant parents whose offspring are at risk for rare gender-linked disorders determine whether they need invasive and costly genetic testing.

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Ultrasounds have a variety of purposes during pregnancy, but the use that often receives the most attention is its ability to reveal the sex of the baby. Some parents-to-be can't wait to find out whether they're having a boy or a girl, while others choose to put off knowing the sex until birth. Either way, a sonogram — the grainy, black-and-white image that results from an ultrasound scan — will be baby's earliest picture and a couple's first chance to see the developing fetus.

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Fetal sex determination, i. Knowing the sex of the fetus does not tell you if it is affected by hemophilia, but it does provide useful information. If the fetus is male, CVS or amniocentesis can be offered to parents who wish to know whether he is affected with hemophilia. If a carrier chooses not to have CVS or amniocentesis, or if these tests are not available, doctors should plan labour and delivery to minimize the chance of bleeding in a male fetus.

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Jamie Mastrangelo has been writing since She received a Bachelor of Arts degree in communications at Pace University where she served as managing editor of her college newspaper. She writes health and feature articles.

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Medical researchers at Melbourne's Murdoch Children's Research Institute have made a new discovery about how a baby's sex is determined -- it's not just about the X-Y chromosomes, but involves a 'regulator' that increases or decreases the activity of genes which decide if we become male or female. An embryo with two X chromosomes will become a girl, while an embryo with an X-Y combination results in a boy," Ms Croft said. High levels of the SOX9 gene are needed for normal testis development. Lead author of the study, Professor Andrew Sinclair, said that 90 percent of human DNA is made up of so called 'junk DNA or dark matter' which contains no genes but does carry important regulators that increase or decrease gene activity.

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