First, myotonic squint. This is a congenital deformity of the neck, which is more common in children and is mostly caused by contracture of the sternocleidomastoid muscle. This kind of oblique neck is mostly related to injury, such as breech birth and fetal malposition, the sternocleidomastoid muscle in the neck is compressed, the blood vessels are compressed and ischemic, the arterial lumen of the sternocleidomastoid muscle on the affected side is embolized, resulting in muscle dysplasia, or muscle edema, inflammation, degeneration of muscle cells, fibrous degeneration, and eventually replaced by connective tissue, resulting in contracture. With the growth and development of children, the face gradually becomes asymmetrical, the head moves forward, the face tilts back, the ear, nose and mouth of the affected side are low, while the healthy side of the face is long, straight and thin. Some children can cause cervical scoliosis and the two eyes are not at the same level. If left untreated, the deformity will gradually worsen as they grow older. The second is bony squint. Bony squint is caused by abnormal development of the cervical spine bones, and the cervical deformity is therefore called Klippel-Feil syndrome. It is also known as congenital bony squint or congenital cervical fusion deformity, which refers to the fusion of two or more cervical vertebrae. The main manifestations are shortening of the cervical spine, low posterior hairline, and limited neck movement. Thirdly, otologic squint. Some diseases can cause hearing loss in one ear, leading to “crooked neck” symptoms, such as unilateral congenital deafness, drug-induced hearing loss and so on. The clinical examination of brainstem auditory evoked potentials can be used to exclude the “crooked neck” caused by hearing damage. The fourth is oculogyric neck. Severe amblyopia, nearsightedness, farsightedness, and congenital strabismus due to hypoplasia of the upper eyelid muscles can all cause a “crooked neck”. Most of these conditions can be treated and corrected through prescription lenses. Some conditions, such as congenital hypoplasia of the upper eyelid muscle, require surgical treatment to cure the strabismus and thus the oculocutaneous squint. Finally, there is also a common clinical condition called developmental delay-induced strabismus. This is caused by an imbalance in the neck muscles that makes the baby’s head unstable and tilted to one side. If the baby is older than 3-4 months and still has an unstable vertical head or prefers to tilt to one side, it is time to visit a specialized pediatric rehabilitation facility. A diagnosis can be made by MRI or ultrasound of the head, and appropriate rehabilitation guidance or training can be provided.