There are no specific clinical symptoms for the birth of a child, and the sex of the fetus is determined by the sex chromosomes. The sex of the fetus is determined by the sex chromosomes. The sex of the fetus is determined from the moment of the union of the sperm and the egg, and there are no specific clinical symptoms, but mainly depends on the type of sex chromosome of the fertilized egg, such as the sex chromosome is XX that is a girl, such as the sex chromosome is XY that is a boy. Early pregnancy reaction of women in early pregnancy is related to the level of human chorionic gonadotropin that rises rapidly in a short period of time in the body, which can be manifested in clinical symptoms such as greasiness, drowsiness, nausea, vomiting, etc., but it does not suggest the sex of the fetus. Fetal sex identification for non-medical needs is not permitted in China, and patients should not blindly carry out sex identification.