Pregnant women are allowed to have breakfast before the non-invasive DNA test, which usually does not affect the test results. Non-invasive DNA test can be performed within 12 to 23 weeks of pregnancy. It is done by drawing peripheral blood of pregnant women to test the free DNA of the fetus and to understand the risk of the fetus to have trisomy 21 and other chromosomal disorders. Unlike liver function, glucose tolerance and Down’s syndrome test during pregnancy, non-invasive DNA test does not require fasting, and eating usually does not affect the test results. If the non-invasive DNA test suggests a high risk, further amniotic fluid test is needed to determine whether the fetus has chromosomal disorders. It is recommended that pregnant women should strengthen nutrition, eat a balanced diet, pay attention to rest, and regularly consult a doctor for obstetric examination during pregnancy.