Fetal weight can be checked by estimating the uterine height and abdominal circumference of the pregnant woman, or by extrapolating the ultrasound indicators from the computerized built-in formula. Fetal weight is an important indicator used to assess the development of the fetus, the fetal weight is abnormal, the clinical diagnosis to provide meaningful data. 1. Estimation of body weight: During the obstetric examination, the doctor can measure the uterine height and abdominal circumference of the pregnant woman with a soft measuring tape, and then multiply the uterine height by the abdominal circumference and add 200 grams to get the estimated body weight of the fetus. 2. Built-in computer formula: Some ultrasound instruments can use the data of different parts of the fetus, such as biparietal diameter, femur length, abdominal circumference, etc., and use the built-in system formula to estimate the weight of the fetus, which can be displayed on the ultrasound examination result. If there is any abnormality in the weight of the fetus it is recommended to go to the hospital in time for treatment under the guidance of the doctor.