The lack of change in fetal weight for nine days after the thirty-third week of pregnancy may be caused by measurement error, insufficient nutritional intake, and fetal growth restriction. 1. Measurement error: fetal weight can be calculated by the uterine height and abdominal circumference of the pregnant woman, or by ultrasound measurement of fetal head circumference, biparietal diameter, femur length, chest circumference and abdominal circumference, etc., which are also measured by the doctor, different doctors measured the value of the original error, the final calculation of the results may be unchanged. 2. Insufficient nutritional intake: Insufficient dietary intake of pregnant women leads to insufficient nutrition for the fetus, resulting in slower fetal development. 3. Fetal growth restriction: Pregnant women have pregnancy complications such as hypertensive disorders of pregnancy, resulting in fetal growth and development being affected, resulting in fetal growth restriction. Nine days is a relatively short period of time, and the lack of weight change does not mean anything. Pregnant women should not worry too much, do a good job of regular checkups, if the fetus appears abnormal timely medical examination, follow the doctor’s instructions to deal with.