Myotonia refers to the tension of muscles at rest, and its function is to maintain the body’s posture and normal movement, which can be divided into resting, postural, and motor. And high muscle tone refers to the state that the muscle is still tense at rest or in a relaxed state. Common causes include diseases of the muscles, peripheral nerves and brain. Hypertonia can lead to more irritability and difficulty sleeping, and some children are unable to walk independently, even affecting normal movement in the future, such as running and jumping, so it is important to identify and actively intervene early. How to determine hypertonia in infants Generally, the hypertonia can be judged by the holding position, body posture, touch and passive movement of the child. A child with hypertonia has a sense of tonicity and resistance when picked up, a sense of tension in the hand, a strong resistance to finger pressure, often an asymmetrical abnormal posture, little active movement, the movement seems stereotypical, and the tester will feel obvious resistance, and the resistance is more at the beginning of the movement than at the end of the movement; a child with hypotonia has difficulty in picking up, a sense of sinking, a soft, loose hand, less resistance to finger pressure, and less resistance to finger pressure. When placed in the supine position, the upper and lower limbs are often flexed and abducted, lacking active movement, feeling heavy when performing flexion and extension movements, no resistance, and no self-control of the limbs. Once the child is found to have high muscle tone, the infant can be insisted to perform passive massage exercises, upward lifting, flat lifting and chest crossed arms exercises, double leg rotation pedal wheel exercises, but pay attention to the strength of the pinch, gentle movements, do not hurt the baby’s bones. Secondly, rehabilitation training can be carried out under the guidance of professional trainers, but parents should not train blindly and should not diagnose themselves. In addition, for other diseases resulting in hypertonia, early intervention and early treatment can be directed at the original disease to prevent brain damage and avoid sequelae.