Most chromosomal abnormalities are detected in the amniotic fluid of the pregnant woman, often to detect the physical condition of the fetus and whether there are genetic abnormalities, and to consider abortion when chromosomal abnormalities are present, otherwise a child with disabilities may be born. Chromosomes are the carriers of genes, and the arrangement of genes on chromosomes controls our body development. Chromosomal abnormalities may lead to congenital diseases and disabilities, which are generally difficult to treat and can only alleviate the symptoms, and some even have no treatment. This option is also chosen out of concern for the fetus, as congenital disabilities and diseases can cause extraordinary psychological and physical distress to the child, so abortion is considered in most cases. This is to avoid the birth of a problem child and to avoid causing some stress to some parents. In the case of chromosomal ectopia, the best option is to get tested before the child is born. Because there is no good technology to treat the diseases caused by these problems, only a very small percentage of people can find a cure.