Nt is to check the child’s nuchal translucency to rule out fetal chromosomal abnormalities and cardiac malformations to prevent the birth of immunodeficiencies. However, after the ultrasound, the child was found to have white bright spots on both legs, which are considered to be high-density tissues, such as cysts or adenomas, or the child’s bone development is abnormal, which can occur. It is recommended to continue to observe and follow up with regular ultrasound examinations, as well as regular prenatal screening, such as Down’s syndrome, non-invasive DNA, etc. It is very important to do a good job of pre-pregnancy and prenatal screening.