Fetal nasal bone shortening at 27 weeks may be caused by chromosomal abnormality, heredity, malnutrition and other factors, which can be handled by termination of pregnancy, observation, dietary adjustment and other methods. 1. Chromosomal abnormality: If non-invasive DNA or other tests reveal chromosomal abnormality leading to short nasal bone in 27-week-old fetus, the pregnancy can be terminated if necessary if it is more serious. 2. Genetic factors: If the parents have a short nasal bone, it may be due to genetic factors that lead to the short nasal bone of the 27-week-old fetus. In this case, regular pregnancy checkups and observation are sufficient, and there is no better treatment. 3. Nutritional deficiencies: If a pregnant woman fails to replenish her daily nutrients during pregnancy, it may lead to short nasal bones in the fetus. At this time, the diet should be adjusted to eat more food rich in protein and vitamins to promote the growth and development of the fetus. If the situation of short nasal bone of 27 weeks fetus occurs, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and symptomatic treatment.