There are no specific clinical symptoms, and the sex of the fetus is determined by the sex chromosomes in the body. The sex of the fetus is determined by the sex chromosomes in the body. The sex of the fetus is determined from the time when the sperm and the egg combine to form a fertilized egg, and there is no specific clinical symptom. The sex of the fetus is determined by the combination of the X chromosome provided by the mother and the X or Y chromosome provided by the father, and a girl is a fetus if the sex chromosome of the fetus is XX, and a boy is a fetus if the sex chromosome is XY. The clinical response of pregnant women in the early stages of pregnancy is related to the rapid increase in the level of chorionic gonadotropin in the body within a short period of time, which is generally manifested as greasiness, lethargy, nausea, vomiting, etc. It is the same for both males and females, and it does not indicate the sex of the fetus. In addition, pregnant women should not blindly identify the sex of their babies after pregnancy, because the identification of the sex of the fetus is not allowed in China.