1. Boy or girl? ——How to predict the gender of the baby. Many expectant parents are very concerned about the gender of the baby during pregnancy and want to know in advance whether they will receive a boy or a girl. In fact, there are many ways to predict the gender of your baby, including B-ultrasound, blood tests, heart rate, etc. Among them, B-ultrasound is the most commonly used method. Judgment is made by observing the fetus\’ reproductive organs, but this is not very accurate in early pregnancy.