Muscle tone is the tension of the muscles at rest in a relaxed state, which is the basis for maintaining various body postures and normal movements. Under normal circumstances, the muscle tone of newborns will be physiologically high, the performance of the quiet state of the newborn limbs flexion, but the newborn limbs to do passive activities easier, with the growth of the age of the nervous system gradually developed and perfect, muscle tone will gradually reduce. However, if the newborn shows significant flexion of the limbs and struggles to move the limbs passively, especially when stimulated and crying, attention should be drawn to prevent pathological hypertonia. Neonatal hypertonia is mainly characterized by tighter muscles, significantly reduced movement of the limbs of the child, and the movement is stereotyped and awkward, the head often can not be placed in a central position, often turned to the side or tilted back, in the shape of an arched inversion. The hands are clenched in a fist shape with the thumb against the palm and the other four fingers holding the thumb, with the back of the hand facing forward and the palm down, and the spine often appears to varying degrees of kyphosis or scoliosis. The hip area cannot be fully extended and remains somewhat flexed, and the lower limbs often appear crossed. The lower limbs are crossed when holding the newborn under the armpits and standing, and the feet land on the tips of the feet. Once a newborn is suspected of having hypertonia, he or she needs to go to the hospital for a relevant examination to find the cause of the hypertonia and to give rehabilitation training under the guidance of the doctor to avoid further elevation of the muscle tone, which may affect the baby’s neurological development.