The normal value of trisomy 18 for Down’s syndrome screening is less than 1/350, it is best to go to a regular large hospital for examination, the test results are more accurate. It is generally recommended to go to the hospital for examination during 16-20 weeks of pregnancy, which can be done by blood sampling. If the Down’s syndrome screening is abnormal and requires further examination, you can go to the hospital for amniocentesis and also blood sampling for genetic examination, etc. If the examination is normal don’t worry, it is best to go to the hospital for 4D ultrasound examination during 24-26 weeks of pregnancy to do a major abnormality examination. During pregnancy, pay attention to rest, strengthen diet and nutrition, it is best not to eat foods that are prone to abortion, such as cinnamon, hawthorn, crab, etc. It is recommended to eat more fresh vegetables and fruits, which can be supplemented with vitamins.