NT1.8mm belongs to the normal range, NT is an important indicator to determine whether the fetus has abnormalities. NT1.8mm indicates that the possibility of fetal abnormalities or chromosomal abnormalities is small, but it does not mean that the fetus does not have abnormalities, so you should continue to observe and have regular maternity checkups. The normal value of NT is below 2.5mm, if NT≥2.5mm is considered as abnormal, it indicates the possibility of chromosomal abnormality or fetal malformation, further prenatal diagnosis is needed. The prenatal diagnosis includes non-invasive DNA and amniocentesis, which can clarify the presence of fetal abnormalities. It is recommended to pay attention to rest and avoid staying up late during pregnancy, and to exercise properly. Pay attention to a balanced diet to ensure adequate protein and other nutritional intake, and take appropriate vitamins and minerals, which are beneficial to fetal development and maternal health. Complete pregnancy tests regularly, seek medical attention in time for any abnormalities, and take treatment measures under the guidance of the doctor.