When is the gender of the fetus easy to see? How many months into pregnancy can the gender of the baby be revealed through B-ultrasound? This is a question that many expectant mothers are very concerned about. Generally speaking, the gender characteristics of the fetus can be checked through multiple B-ultrasound examinations before birth. Specifically, an ultrasound examination performed around 12 weeks of pregnancy can initially determine the gender of the fetus, while a B-ultrasound examination performed around 20 weeks of pregnancy is the most accurate time to determine the gender of the fetus. B-ultrasound characteristics of male and female fetuses. B-ultrasound examination determines the gender of the fetus mainly by observing its genital development. Generally speaking, boys’ genital hair