It is not true that boys are advanced and girls are delayed, there is no such statement in the clinic, and there is no scientific basis.
The sex of the fetus is mainly determined by the chromosomes of the sperm, and the expected date of delivery is mostly related to the usual menstrual cycle, ovulation cycle, whether the development of the fetus is abnormal or not, and the amount of exercise during pregnancy. Therefore, the early or late delivery of the fetus has no direct relationship with the sex of the fetus.
Clinically, the expected date of labor is generally two weeks early or two weeks late, which is within the normal range. Generally after 37 weeks of pregnancy is a full-term pregnancy, need to be ready for delivery, when the pregnant woman appears abnormal phenomena, it is recommended to consult a doctor in a timely manner. Consult your doctor for more information.