The etiology of fetal clubfoot is unclear, but it is associated with genetic factors, histologic abnormalities, vascular abnormalities, and intrauterine factors. 1. Genetic factors: the incidence of clubfoot varies greatly according to race and gender. Those with clubfoot in their first child have a several times higher chance of having clubfoot in their second child than the general population. 2. Histologic abnormalities: Bone abnormalities can lead to defective cartilage development. 3. Vascular anomalies: hypoplasia or absence of the anterior tibial artery. 4. Intrauterine factors: Fetal growth retardation refers to the development of inversion of the fetus starting in the 9th week and becoming apparent in the 10th week. Fetal growth retardation due to unknown causes of inversion of the foot. Or infection with a virus, which damages the anterior horn cells, leads to entropion. In case of fetal foot inversion, you need to go to the hospital as soon as possible for treatment.