There is generally no scientific basis for the birth of a boy or a girl. The sex of the child is determined mainly by the two chromosomes of the fertilized egg and cannot be interfered with by human beings. The sex of the child is determined by the sex chromosomes of the mother and father. If the sperm provides the X sex chromosome and the egg provides the X sex chromosome, the fertilized egg formed by the union will be a girl. If the sperm provides the Y sex chromosome and the egg provides the X sex chromosome, the fertilized egg will be a boy. When the fertilized egg is formed, the sex of the fetus is already formed and cannot be changed. At present, the state regulations non-medical prohibit sex identification, whether it is a boy or a girl, should be treated equally, do not produce patriarchal thinking. During pregnancy, pregnant women need to ensure sufficient rest time, do not overwork. Keep the perineum clean to avoid secondary infections, and eat foods rich in vitamins and proteins during pregnancy.