The sex of the fetus can usually be determined around the 16th week of pregnancy, but the law does not allow for the identification of the sex of the fetus. From the fertilization of the egg to the end of the twelfth week, the external genitalia of the fetus has begun to develop, in order to accurately identify the sex of the fetus, it is generally not until the 16th week of pregnancy to go for fetal sex identification, so if you need to identify the sex of the fetus, most of the recommendations are to start after the 16th week of pregnancy. However, the current domestic law clearly stipulates that pregnant women are prohibited from undergoing fetal sex determination during pregnancy, unless the fetus suffers from chromosomal abnormalities. Therefore, it is not feasible for pregnant women to identify the sex of the fetus at 16 weeks, and regular hospitals and professional doctors will not identify the sex of the fetus for pregnant women. It is recommended that pregnant women and their families should not be too concerned about the sex of the fetus, and should do a good job in every obstetric examination after pregnancy and pay attention to the health of the fetus.