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When is the sex of a fetus determined

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Boy or girl? The difficulties of early gender prediction

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Sex Begins in the Womb - Exploring the Biological Contributions to Human Health - NCBI Bookshelf

One of the most exciting things about having a child is learning the gender of the baby. Many people choose to find out as soon as possible, while others decide to keep it a surprise. Although you may not see sex organs on a sonogram for weeks, a baby's sex is determined long before it arrives in the world. Gender is determined immediately upon fertilization. The 23rd pair of chromosomes establishes the sex of the baby.
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How Soon Can You Find Out the Sex of Your Baby?

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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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. At an early stage in embryonic development, both sexes possess equivalent internal structures.
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