Amniocentesis does not detect clubfoot, and the diagnosis of clubfoot depends mainly on ultrasound. The most common foot deformity and a common birth defect after birth, the diagnosis of hallux valgus is mainly made by ultrasound during pregnancy, but it needs to be differentiated from the normal state of hallux valgus in the fetus. It is generally believed that the emergence of clubfoot is a combination of genetic factors and adverse environmental influences during preconception and early pregnancy. When clubfoot is diagnosed by ultrasound, the doctor at the prenatal diagnostic center should be consulted as to whether amniocentesis is needed to rule out chromosomal abnormalities. Current research shows that pesticides, plasticizers, detergents, and heavy metal compounds and other factors that pollute the environment caused by fetal malformations are on the rise. Therefore, women should avoid exposure to toxic and hazardous substances in preparation for and during pregnancy. If ultrasound during pregnancy suggests that the fetus has clubfoot, consult a prenatal diagnostic center or a pediatric surgeon to find out the prognosis.