There are five main causes of infantile squint: 1) muscle causes: such as muscle spasm and weakness of the patient causing muscular squint; 2) skeletal causes: caused by the patient’s bone development deficiency, atlantoaxial joint subluxation, etc.; 3) nerve damage: such as cerebral palsy symptoms after the patient’s brain nerve damage, causing muscle asymmetry and thus triggering squint; 4) secondary damage: such as poor hearing, strabismus, etc., can also lead to compensatory squint; 5) habit causes: such as improper sleeping posture of the patient, etc.