After pregnancy, you can clarify whether it is a daughter or a son through chromosome test, ultrasound, 4D ultrasound, but our law prohibits the identification of male and female. 1. Chromosome test: Early pregnancy can be tested for the sex of the fetus by taking peripheral blood of the pregnant woman after 7 weeks. 2. Ultrasound examination: At about 20 weeks of pregnancy, the external genitalia of the fetus have obvious gender expression, and the gender of the fetus in the womb can be distinguished through ultrasound examination. 3. 4D ultrasound: after 22 weeks of pregnancy, the gender of the fetus can also be distinguished through 4D ultrasound. Only through the four-dimensional ultrasound examination, the gender of the fetus is clearer and more accurate. China’s laws and regulations have relevant provisions, prohibit non-medical needs for any form of fetal sex identification, only in the premise of medical needs can take the following methods for male and female sex identification.