The nasal bones may not be clear, there are the following clinical possibilities: firstly, the position of the fetus may not be good, in this case, you can wait for a week or find another tertiary hospital to re-examine it. In the second case, some pregnant women have some viral infections during pregnancy or Down’s syndrome induced by toxic substances used during pregnancy, resulting in unclear nasal bone display. In the third case, the fetus itself has abnormal development and chromosomal abnormalities, in this case, the clinical diagnosis needs to be confirmed as soon as possible, if the nasal bone is diagnosed to be hypoplastic and Down’s syndrome is considered, the clinical opinion of the pregnant woman, her family and related departments such as obstetrics and gynecology needs to be consulted to decide whether to keep (the fetus), in this case, if it is forcibly kept, it may cause harm to the future family life of the pregnant woman, family burden and The current uterus is also a harm.