Down’s screening for trisomy 18 critical risk, it is best to do another non-invasive DNA test or amniocentesis, because when doing Down’s screening for critical risk, the baby may have Down’s syndrome after birth, in order to achieve eugenics it is recommended to do further tests to determine the specific development of the fetus before allowing the baby to be born. If there is a problem with the non-invasive DNA test, further tests are needed to do amniocentesis, which is the final result. If there is no problem with the fetus doing amniocentesis, the baby can be born successfully. If the amniocentesis suggests chromosomal abnormalities, it is possible that the pregnancy may need to be terminated. Babies born with Down’s syndrome will be mentally retarded or unable to care for themselves after birth.