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Fetal sexual development and hormones

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If you just discovered that you're pregnant, you will likely spend the next months ahead wondering how your baby is growing and developing. Questions like: "What color will my baby's eyes be? You may even wonder about your baby's brain development. Fortunately, fetal brain development typically follows a pretty predictable schedule.
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Sexual differentiation in humans

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Sexual differentiation in humans - Wikipedia

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. These are the mesonephric ducts and paramesonephric ducts.
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Your Guide to Pregnancy Hormones

Thyroid hormones are critical for development of the fetal and neonatal brain , as well as for many other aspects of pregnancy and fetal growth. Hypothyroidism in either the mother or fetus frequently results in fetal disease; in humans, this includes a high incidence of mental retardation. Normal pregnancy entails substantial changes in thyroid function in all animals. These phenomena have been studied most extensively in humans, but probably are similar in all mammals. Major alterations in the thyroid system during pregnancy include:.
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Sexual differentiation is the process of development of the differences between males and females from an undifferentiated zygote. As male and female individuals develop from embryos into mature adults, sex differences at many levels develop, such as genes , chromosomes , gonads , hormones , anatomy , and psyche. These processes are not fixed, and can change over one organism's lifetime or over many generations evolutionarily. Humans, many mammals, insects and other animals have an XY sex-determination system.
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