The color ultrasound examination at 17 weeks of pregnancy may not necessarily be able to see the complete development of the spine. 17 weeks pregnant although the fetus has been formed, but the internal organs are not very well developed, but also not to the time when you can do four-dimensional ultrasound, general ultrasound examination may not be able to clearly see the development of the fetal spine, you can wait until the 22nd week of pregnancy to do four-dimensional ultrasound to assess. At this time to do obstetrics generally through the mid-pregnancy Down’s syndrome screening and other serologic tests to assess the fetus has no developmental abnormalities, if the screening results for high-risk, it is also necessary to do amniocentesis and other clear diagnosis. All in all, it is recommended that pregnant women go to regular hospitals for regular checkups as prescribed by the doctor, so that fetal abnormalities can be detected in time and dealt with as early as possible.