Development of sex in fetus

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No matter where they live, many people eventually end up having kids, even in some of the most out-of-the-way spots on the planet. But, will they be able to live and work in space and have children? Or on the Moon? Or on Mars? Humans being humans, they will very likely try.
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How Human Reproduction Works

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Sexual differentiation in humans - Wikipedia

By: Craig Freudenrich, Ph. Many expectant parents look forward to the doctor's appointment that comes 20 weeks into the pregnancy -- that's when an ultrasound can usually reveal the sex of their baby. The sex of that baby is determined at the exact moment when egg and sperm meet, but it takes a while for the external organs to match the internal chromosomes. As an embryo develops, it acquires both Wolffian and Mullerian ducts. Wolffian ducts develop into male sex organs , and Mullerian ducts develop into female sex organs. Which sex organs develop depends on the presence of a Y chromosome and the male hormone testosterone and anti-Mullerian hormone AMH.
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Fetal testosterone and sex differences in typical social development and in autism

From the time of conception until birth, a human fetus undergoes complex changes in its cells and tissues that ultimately produce fully functioning organs. Each developing organ is programmed to carry out its specific role in maintaining the baby's body after birth, but all form from just a few cells that make up the early embryo. After fertilization, cells in the tiny embryo divide many times to form a ball of undifferentiated cells. Early in development, the ball of fetal cells flattens and cells organize themselves into three layers, called endoderm, mesoderm and ectoderm. A few days after fertilization, the embryo implants into the uterine lining.
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Prenatal development is highly influenced by the inheritance, expression, and regulation of genes. Developmental psychologists consider the process of human development as it relates to physical, cognitive, and psychosocial development. Prenatal development is the process that occurs during the 40 weeks prior to the birth of a child, and is heavily influenced by genetics. There are three stages of prenatal development— germinal, embryonic, and fetal.
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