Recent information shows that the proportion of defective children born in China is as high as 5.6%! The causes of various defects are complex, mainly in the following four aspects: 1, genetic factors related to chromosomal and genetic number and structure changes; 2, life diseases, work occupational factors such as exposure to chemical substances, toxic drugs (especially chemotherapy drugs), radiation, high temperature environment, high fever due to illness, the use of antibiotics due to disease; 3, biological infection factors such as mycoplasma, chlamydia, bacteria, viruses, parasites, etc. 4, bad life habits such as (active or passive) smoking, drug addiction, alcoholism, etc.