1. Nutritional status of pregnant women: The diet of pregnant women should be balanced and diversified, and sufficient nutrients such as protein, vitamins and minerals should be taken to ensure the normal development of the fetus.
2. Lifestyle of pregnant women: Pregnant women should avoid bad habits such as smoking, drinking and using drugs, while maintaining proper exercise and rest to avoid overwork and mental stress.
3. History of pregnant women's diseases: If pregnant women suffer from certain diseases, such as hypertension, diabetes, thyroid dysfunction, etc. It may have an impact on fetal health.
4. Medication for pregnant women: Pregnant women should avoid using some harmful drugs during pregnancy, such as some antibiotics, analgesics and antiepileptic drugs. In order to avoid adverse effects on the fetus.
5. Environmental pollution: pollutants such as chemicals and radiation in the environment may also have an impact on the health of the fetus.
6. Genetic factors: Some diseases are caused by gene mutation, and these diseases may be inherited in the family, thus affecting the health of the fetus.