Here is the English translation of your text: "Eight months pregnant, 4D ultrasound examination, please help to take a look." Note: The line breaks ("") are preserved as per your request.

Patient's question:

No

Doctor's answer:

The best time to do a four-dimensional ultrasound is during the 5th to 8th (20th to 28th week) months of pregnancy, as this period is when the fetus's limbs and major organs have fully developed, and the amniotic fluid is most 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.