There are many folk rumors about predicting \”pregnancy of a boy\”: B-ultrasound gestational sac is long, the front wall of the placenta is long, the biparietal diameter is long, the pregnant woman becomes ugly and black, the belly button is long and thin, the fetal movement is frequent, the fetal heart rate is low, and morning sickness is mild, Early bleeding, belly bulging, B-ultrasound small intestine signs, nipple tingling, hard belly button, early back pain and swelling, poor energy, drastic change in taste, etc. However, these claims lack scientific basis. The gender of the fetus is determined by the parents’ chromosomes, and pregnancy experiences are diverse. Gender prediction rumors should not be believed in superstitiously.