Fetal congenital malformation

Congenital malformations are morphological or structural abnormalities that exist at birth. There are single malformations (such as cleft lip, multiple fingers, etc.) and multiple malformations. Many kinds of multiple malformations are caused by a combination of specific causes under the action of a certain cause, and become malformation syndromes. At present, more than 250 types of malformations have been identified and diagnosed. The agents that can cause congenital malformations are chemical, physical or biological, and are called teratogens or teratogens. A variety of teratogenic factors have been found. Their harmful effects can be confirmed in animal experiments, and only a few can be confirmed to have an impact on humans. Therefore, it can only be regarded as a great potential danger to human beings and should be taken seriously.