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Between week 7 and week 12 of pregnancy, the foundations of your babys sex organs develop. At about week 9, a baby boys genitals begin the process of becoming male. Although your babys gender is determined immediately upon fertilization, you will not be able to know the sex until about the 16th to 18th week of pregnancy. At around the sixth week your baby will develop a small bud called the genital tuber at the site of the genitals. 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. By the 20th week of pregnancy the external genitalia changes are done. On ultrasound, if your baby is cooperating and is positioned in a favorable way, his or her sex can be identified as early as the 16th to 18th week of your pregnancy. The male fetus may show a round bulbous area within the genital area which is the scrotum and penis. A baby who inherits the x chromosome from the father is a genetic female (a pair of x chromosomes). The wolffian duct will degrade, and the mullerian duct will develop into female sex organs. When do babies develop their sex? The process through which gender is determined is called human sexual differentiation. You wont find out about your babys gender until your pregnancy is a few months along, but it has already been set in stone from the moment of conception. At around 7 weeks, your babys internal sex organs such as ovaries and testes begin to form in the abdomen. Male and female sex organs and genitalia look the same at this stage because theyre derived from the same structures. At around 9 weeks, boys and girls begin to develop differently. The babys brain and spinal cord will develop from the neural tube. The heart and other organs also are starting to form and the heart begins to beat. Structures necessary to the formation of the eyes and ears develop. Your babys sex is set at conception by the sex chromosome received from the sperm (x for girl or y for boy), but it takes a while for the actual body parts to develop. The internal sex organs the testes in boys and the uterus and ovaries in girls look the same until 9 weeks of pregnancy.

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