An nt value of 2.6mm is not a serious problem. The nt test is a test for early exclusion of Down syndrome and congenital heart disease. Because of the large error in the measurement of the small fetal ultrasound, its diagnostic significance is not great and does not necessarily mean that the child has abnormal developmental problems. As the child develops, it can be rechecked, and if it is still high after the recheck, further relevant tests can be done, and mid-term Down’s syndrome screening can be done to rule out Down’s syndrome. If the Down’s syndrome screening indicates a high risk, amniocentesis can be considered to extract DNA to confirm the diagnosis, and non-invasive DNA testing can also be done, which has a high accuracy rate. At the same time, you can do the 4-dimensional teratology to rule out abnormal fetal heart development, early abnormalities do not have to worry too much about too many interfering factors, relax and do regular preconception checks.