The risk rate for Down’s syndrome is around 1/700-1,000. The older the pregnant woman is, the higher the risk rate of Down syndrome. For pregnant women at high risk, direct chromosomal testing, i.e. non-invasive DNA or amniocentesis, is needed to avoid the occurrence of Down’s syndrome, also known as congenital stupidity. Pregnant women who have children must be screened for Down’s syndrome, which can be calculated by drawing blood to find out the risk rate. For high-risk pregnancies, further non-invasive DNA or amniocentesis tests must be performed. If you are a senior pregnant woman, or have a Down’s child in your family, or have had a Down’s child before, you can avoid the occurrence of Down’s children by not having a Down’s screening test and having a non-invasive DNA or amniocentesis test directly.