Where is it allowed to do B-ultrasound for boys and girls near Beixiang Station in Xiangcheng County, Henan Province?

Generally, after 16 weeks of pregnancy, B-ultrasound can preliminarily judge boys and girls, but it is not 100% accurate, and the accuracy rate is about 80%. Regular hospitals can't find out the sex of children. Selfishly checking the sex of a child is illegal, and there is no good way to judge the sex of a child. It can't be judged by pregnant stomach, early pregnancy reaction, fetal movement and pregnancy time.