NT is an abbreviation for nuchal translucence, which means “nuchal translucency” in Chinese, and is an ultrasound test result used to screen for congenital malformations of the fetus, and is not related to the sex of the fetus, which is not possible to be seen through the NT data. The NT test is usually performed between 11 and 13 weeks of gestation, and clinicians use the thickness of the NT and the results of maternal serum biochemical indicators to speculate on the possibility of chromosomal abnormalities in the fetus. NT examination can increase the detection rate of fetal chromosome aneuploidy and reduce the false positive rate, and is one of the routine programs of prenatal examination. However, it is not possible to tell the sex of the fetus from the test data because there is no relationship between the two. NT thickening is generally considered to be greater than 2.5mm, which may indicate a risk of fetal chromosomal abnormalities or heart problems, and pregnant women need further testing. However, NT thickening does not necessarily mean that there is something wrong with the fetus. Pregnant women do not need to worry too much and can cooperate with their doctors to complete further tests.