Determine fetus sex

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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. If these enhancers that control testis genes are disrupted it may lead to a baby being born with a disorder of sex development. Professor Sinclair, who is also a member of the Paediatrics Department of the University of Melbourne, said this study sought to understand how the SOX9 gene was regulated by enhancers and whether disruption of the enhancers would result in disorders of sex development.
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Sexual differentiation in humans

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When Can You Find Out the Sex of Your Baby?

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 7 , the 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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Am I Having a Boy or Girl? — Ultrasound & Sex Prediction

The million dollar question for many after finding out about a pregnancy: Am I having a boy or a girl? Some people love the suspense of not knowing the sex of their baby until the delivery. Of course, only a doctor can reliably determine the sex of a baby.
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The guessing game begins almost as soon as you get a positive result on a pregnancy test. Will it be a girl? Or a boy? But some moms have it much worse, suffering from severe nausea and vomiting called hyperemesis gravidarum , often leading to weight loss, malnutrition and dehydration.
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