17 weeks pregnant black and white ultrasound to see men and women is not necessarily accurate, in our country non-medical need for fetal sex identification is illegal. Generally about 16 weeks of pregnancy fetal genitals are basically developed, 17 weeks of pregnancy through the ultrasound is generally able to distinguish the sex of the fetus, but the accuracy rate is not 100%, this is with the ultrasound doctor’s skills, experience, machine precision and fetal position have a lot to do. Can not privately identify the sex of the fetus, China’s laws prohibit non-medical needs of fetal sex identification, identification of the doctor is also required to bear legal responsibility, regardless of the boy or girl, the healthy development of the fetus is the most important. Pregnant women to maintain a good state of mind, pay attention to rest, strengthen nutrition, do not pay too much attention to the sex of the fetus.