Don’t be overly concerned if the nasal bones are unclear in the NT. The nasal bone may be slow to develop when the fetus is just developing, which may cause it to appear unclear. As the gestational age increases, it may become normal after the examination. In the fetal stage, the nasal bones need to be developed in a process, which is flat at the beginning and will gradually become prominent as the months increase, forming a normal nose shape. During pregnancy, it is important to maintain a relaxed mood and avoid taking drugs with teratogenic effects orally to avoid abnormal development. If the fetus is born with a congenital deformity of the external nasal bone, it can be treated by surgery after the age of three.