A biparietal diameter of 92mm and a femur length of 73mm do not determine whether the fetus is a boy or a girl. Biparietal diameter refers to the length of the widest part of the fetal head between the right and left sides of the head, with the increase of fetal months and change, through the size of the biparietal diameter can reflect the development of the fetus. Femur length is the length of the thigh bone of the fetus, which also changes with the growth of the fetus, and the length of the fetus can be roughly estimated by its length. Therefore, biparietal diameter and femur length do not determine whether it is a boy or a girl. In addition, pregnant women should take more nutrients, maintain a happy mood, undergo regular checkups, and seek timely medical treatment for any discomfort under the guidance of a doctor.