Typical symptoms of hypertonia in children are straightening and crossing of the lower limbs internally in a scissor-like manner. Hypertonia is a neurological disorder in which the muscles are stiff and feel restricted in movement, and children and newborns are the most common groups with this disorder. Children with hypertonia tend to have a dorsiflexion angle of ≥90°, and typical symptoms include lower extremity extension and inward crossing in a scissor-like fashion. In addition, children with high dystonia are more easily provoked, continue to cry, smell and frighten, have difficulty sleeping, it is difficult to separate the legs when changing diapers, it is difficult to insert their arms into the sleeves when putting on tops, it is difficult to open their clenched fists when bathing, and their whole body immediately becomes stiff when their lower limbs just touch the bathtub or the water. Some children, when examined by a doctor, often show muscle tension, because the child is very sensitive to unfamiliar environments and the doctor’s examination, and will cry, crying can be shown as hyperextension of the lower limbs stiffness, often by some clinically inexperienced doctors mistaken for high muscle tone. Parents should pay attention to their children’s high dystonia, because high dystonia often indicates that the child has suffered brain damage, and may have pediatric cerebral palsy, which is very harmful and should be sent to the hospital in time for diagnosis and treatment.