The indicators of fetal development at 24 weeks of pregnancy mainly look at the fetal biparietal diameter, femur length, fetal head circumference and abdominal circumference. The fetal biparietal diameter at 24 weeks of pregnancy is around 6.1cm, femur length is around 4.0cm, fetal head circumference is around 22cm and abdominal circumference is around 19.7cm. In addition to the above developmental indicators, we should also pay attention to the fetal length, weight and the existence of deformities, which are generally about 30cm in length and 630g in weight. 24 weeks of pregnancy, if you find that the fetal development is less than the standard value, you should first check the week of pregnancy carefully. If the pregnant woman’s menstrual cycle is irregular, the ovulation time is delayed and the fertilization time is also delayed, which may cause the inaccurate gestational week. If the pregnant woman has regular menstrual cycle and normal gestational week, and there is indeed small fetal development, she should have relevant laboratory tests and examinations, such as glucose tolerance test and blood pressure measurement, to exclude gestational diabetes, gestational hypertensive disease and viral infection, and have regular follow-up ultrasound to pay attention to any abnormal fetal growth and development. If abnormalities are found in the fetus during the ultrasound, amniocentesis can be used to further clarify the diagnosis if necessary, and attention should also be paid to the amniotic fluid volume and placenta.