The causes of Down’s children are the following: first, may be caused by parental chromosomal abnormalities, genetic factors; second, the embryo in the process of growth and development will be affected by many factors, such as external environmental factors, dietary factors, etc., if often exposed to chemicals, such as heavy metals, may lead to chromosomal aberrations, resulting in the emergence of Down’s children, in the process of embryonic growth and development should pay attention to regular visits to The first thing you need to do is to take a Down’s test to see if there is a high-risk syndrome, and if there is a high risk, it is recommended to terminate the pregnancy in time; thirdly, it is also related to the disease during pregnancy, if you have gestational diabetes, hypertension and other diseases will affect the growth and development of the fetus, and the embryo will be stunted or deformed, which may also lead to such symptoms.