Patient's question:
Over a month ago, the head circumference was 30cm.Doctor's answer:
The best time to do a four-dimensional ultrasound is between the 5th and 8th months of pregnancy (20-28 weeks), because during this period the limbs and major organs of the fetus have fully developed, and the amniotic fluid is more suitable for fetal anomaly screening. However, due to individual differences among pregnant women, please contact your doctor for your specific timing and follow the doctor's advice.