In a fetus which sex organ is developed first

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In the end, families are happy to welcome their healthy new addition regardless of sex. The process through which gender is determined is called human sexual differentiation. All eggs contain an X chromosome, while sperm can have an X or a Y chromosome. If the egg is fertilized by a sperm cell carrying an X chromosome, the resulting XX embryo will be a girl. On the contrary, if the sperm cell has a Y chromosome, the embryo will have male XY chromosomes.
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When Does a Baby Develop Gender?

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Your Baby's Development: The First Trimester -

The start of pregnancy is actually the first day of your last menstrual period. This is called the 'menstrual age' and is about two weeks ahead of when conception actually occurs. Each month a group of eggs called oocytes is recruited from the ovary for ovulation release of the egg. The eggs develop in small fluid-filled cysts called follicles. Normally, one follicle in the group is selected to complete maturation.
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Fetal Development: Your Baby’s Sex

Embryos with XY chromosomes become boys, and those with XX chromosomes become girls. That means that all our sex organs come from the same foundations: The testes in men are equivalent to labia and ovaries in women, and the penis is the equivalent of the clitoris. At around week 7 , the Y chromosome signals for the start of testosterone production, and male genitalia begin to develop. Between 16 and 20 weeks, testosterone levels fall until they reach the range found in early puberty by about 24 weeks. The genital ridge starts lengthening around week 9 to form the penis.
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The development of the reproductive systems begins soon after fertilization of the egg, with primordial gonads beginning to develop approximately one month after conception. Reproductive development continues in utero, but there is little change in the reproductive system between infancy and puberty. To become a male, an individual must be exposed to the cascade of factors initiated by a single gene on the male Y chromosome. Because females do not have a Y chromosome, they do not have the SRY gene.
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