According to Jiaojiang Oriental Doctor, it is not until 22-26 weeks of pregnancy that it is a good stage for detailed detection of fetal development. During this period, the fetal anatomical structure has been formed and the amniotic fluid is moderate. After four-dimensional color Doppler ultrasound, you can see the size of the fetus and the image is clear. Most fetal malformations can be shown at this stage. At this stage, four-dimensional color ultrasound can also see the baby's heartbeat, visceral peristalsis, yawning, stretching and so on. And you can feel the joy of being a mother.