The causes of infantile adductor pollicis may be related to congenital problems or due to cerebral ischemia and hypoxia. 1. Congenital problems: commonly found in cerebral hypoplasia, cerebral hypoplasia, abnormal brain development, congenital metabolic disease, etc., all of which may lead to infantile adductor pollicis, and may be accompanied by developmental delay, mental retardation and other problems. 2. Cerebral ischemia and hypoxia: commonly seen in cerebral palsy, placental abruption, umbilical cord blood flow blockage, neonatal asphyxia and other factors, leading to cerebral ischemia and hypoxia, which may result in the infant’s large angle of the adductor muscle, and may also be accompanied by speech disorders, mental retardation and other problems. Infantile adductor hallucis may also be caused by other reasons, it is recommended to consult a doctor as soon as possible to identify the causative factors and then give targeted treatment.