Patient's question:
Here is the English translation of the provided text:"Which develops first, the arms or the legs of the fetus?
Is the femur the thigh bone?
Can a 3.5-month fetus's ultrasound detect whether it is deformed!?"
Doctor's answer:
It can rule out most of the fetal abnormalities, of course, it's not 100% accurate. The screening for fetal abnormalities is highly related to the gestational age, position of the fetus, and amniotic fluid (for example, the fetus is often clenched in the uterus, so it's impossible to count the fingers and toes clearly). The best time to perform a systematic fetal abnormality screening is between 18-26 weeks. You can choose 3D or 4D color Doppler ultrasound for a clearer view.