A very experienced sonographer can usually tell the sex of a fetus at 14 weeks of gestation, but for less experienced sonographers, it takes about 17 weeks before they can tell the sex of a fetus. In China, it is illegal to use ultrasound to identify the sex of a fetus, and not only will you be fined, but you may also have your license to practice revoked. In addition, with the development of the times, people’s preference for men over women is no longer in line with the historical trend, so it is recommended that we do not identify the sex of the fetus.