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  in girls, development of external sex organs remains pretty much static over time. By about week 20 of pregnancy, your baby girl will have 7 million primitive eggs, which will pare down to about 2 million by the time shes born. Sexual differentiation, in human embryology, the process by which the male and female sexual organs develop from neutral embryonic structures. The normal human fetus of either sex has the potential to develop either male or female organs, depending on genetic and hormonal influences. During pregnancy, the fetus is protected from sexual thrusting and unwanted semen by the amniotic fluid in the womb and by the cervical mucus plug in the womans cervix, which forms shortly after conception. Sexual intercourse after giving birth can begin when the couple are both ready. The hormonal theory of sexuality and gender identity holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation and or gender identity that emerges later in the adult. Differences in brain structure that come about from chemical messengers and genes interacting on developing brain cells. National institutes of health, national library of medicine, gender-related differences in fetal heart rate during first trimester, 2006.   your developing baby is protected by the amniotic fluid in your uterus, as well as by the strong muscles of the uterus itself. Sexual activity wont affect your baby, as long as you dont have complications such as preterm labor or placenta problems. However, pregnancy can cause changes in your level of comfort and sexual desire. Involves using antenatal testing to identify the sex of the fetus, then terminating the pregnancy where the fetus is of the undesired sex.   during this stage, your fetus is looking and operating more like a real baby. Early on, their sex organs are developing, their bones are getting stronger, and fat is starting to accumulate on.

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