Fetal weight can be measured by palpation and ultrasound. 1. Palpation method: Pregnant women can measure the abdominal circumference after emptying the bladder and the height of the uterus from the midpoint of the superior border of the pubic symphysis to the midpoint of the uterine fundus under the operation of a specialized doctor, and then estimate the weight of the fetus by extrapolating the measured values. 2. Ultrasound examination: Ultrasound examination is mainly based on the fetal biparietal diameter, head circumference, abdominal circumference, femur length and other indicators, after the corresponding formula to estimate the fetal weight. The accuracy of this method of estimation is usually related to the operation of the ultrasound doctor, for more experienced doctors, the accuracy rate is relatively high. It is recommended that pregnant women choose regular hospitals and professional doctors to carry out the examination, and when abnormalities are found after the examination, they should consult the relevant doctors in a timely manner, in addition, pay attention to diet and nutrition in life, and carry out regular obstetric examinations.