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When can we tell whether the fetus is male or female?

User Yogzzz
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Final answer:

The biological sex of a fetus can usually be determined with almost 100 percent accuracy using obstetric ultrasound at around week 12 of pregnancy.

Step-by-step explanation:

The biological sex of a fetus can usually be determined with almost 100 percent accuracy using obstetric ultrasound at around week 12 of pregnancy. During weeks 9 to 15 of pregnancy, the reproductive organs of the fetus develop rapidly, and by week 12, the external genitals of male and female fetuses are clearly differentiated.

User Fuseblown
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