Congenital myotonic squint is a deformity in which one side of the sternocleidomastoid muscle has a fibrous contracture that causes the neck and head and face to deviate to the affected side. It can be caused by fibrosis of the sternocleidomastoid muscle from a variety of causes, and the gradual contracture leads to the appearance of a sloping neck. The cause of fibrosis is not well understood. Currently, it is thought to be caused by bleeding, hematoma and contracture of the sternocleidomastoid muscle due to breech delivery, birth injury and stretching. The clinical manifestation is the unintentional discovery of a mass on one side of the sternocleidomastoid muscle half a month after the birth of the infant, and then the mass gradually becomes hard, inactive, shuttle-shaped, and finger-sized. The mass gradually subsided in about six months, but the sternocleidomastoid muscle became fibrous contracture, shortened, and striped, pulling the occipital area and favoring the affected side, and the lower jaw turned to the healthy shoulder. With growth and development, both sides of the face are asymmetrical, the healthy side is full, the affected side becomes smaller, both eyes are not at the same level, and in severe cases, cervical scoliosis can be secondary. Among the outpatients who go to the clinic with squint, muscular squint is the most common, but there are also some other causes of squint, so differential diagnosis is needed: 1, bony squint: cervical spine abnormalities such as atlantoaxial subluxation, hemivertebrae, etc., sternocleidomastoid muscle is not contracted, X-ray examination can confirm the diagnosis. 2, cervical inflammation: there is lymph node enlargement, local pressure pain and systemic symptoms, no contracture of sternocleidomastoid muscle. 3.Ocular muscle abnormality: the muscle strength of the extraocular muscles is unbalanced, and patients with strabismus coordinate their vision with neck deviation. 4.Postural strabismus: Most of the children are always fed and nursed on the same side after birth, and the children have habitual head and neck deviation to one side. Early detection and early treatment are effective, and more than 80% of them can be cured conservatively and exempted from surgery. Late stage squint can be surgically corrected, but combined other tissue abnormalities (e.g. facial asymmetry deformity, cervical scoliosis) are difficult to restore to normal. After the diagnosis of myelomeningocele in newborns, the cure rate is generally over 85% with the use of regular massage therapy. When myelomeningocele is detected, it is generally recommended that the earlier the treatment is given, the better. Surgical treatment is suitable for children around 2 years old. Generally, a transverse incision is made at one transverse finger on the proximal clavicle, and for children aged 1-4 years old with mild disease, only the clavicular and sternal heads of the sternocleidomastoid muscles are cut off, and an orthopedic neck brace is applied after surgery to maintain and slightly over correct the position, and the child’s jaw is frequently rotated to the affected side and the occiput to the healthy side. For those who are more than 4 years old and have severe oblique neck, upper and lower sternocleidomastoid muscles can be cut and released.