The diagnosis of congenital myotonic neck is based on the exclusion of brain injury, spinal deformity, strabismus and other diseases that cause the disease. Most of the children’s mothers have been lying on their left side for a long time during pregnancy, which is the main cause of this disease. Of course, there are also some other causes of “external neck disease”, including oculocerebral, osseous and auriculocerebral, etc., but we encounter less of them in Chinese medicine. Modern medicine believes that pregnant women should try to sleep on the left side at night, because this is conducive to the oxygen supply and blood supply of the fetus in the abdomen, and at the same time will not cause extrusion of the fetus in the abdomen. This total viewpoint we all agree, but ignore a very important aspect, that is, if the regular left-sided position, so that the baby in the abdomen always keep nearly the same position, will inevitably cause the baby’s posture abnormal, the head is very long to the side, which increases the incidence of “crooked neck” disease. Therefore, we recommend that pregnant women take frequent walks to facilitate the normal growth of the fetus.