Myths: Some babies have increased muscle tone because they are sensitive, not because they have cerebral palsy. Myotonia is the force generated by muscle cells pulling on each other to maintain various body postures and normal movement. Increased muscle tone is mainly characterized by stiffer muscles, increased resistance to passive movement, and reduced range of motion of joints. Parents can easily observe such things as straight, crossed and scissor-like lower limbs, inability to separate the baby’s legs when changing diapers, pointed feet, and inability to bring the two hands together. In cerebral palsy, both active and passive muscle tone is high, along with postural abnormalities. However, some babies are more sensitive and show increased passive muscle tone (measured by the angle of the adductor, popliteal fossa and dorsiflexion angle of the foot) when examined, but not high muscle tone when relaxed and normal muscle tone during active activities, without abnormal posture and with motor development at the level of their age. In the past, it was thought that these children should do rehabilitation training, but the results were not good and they cried too much to persist, so they had to go home. Some children were found to crawl and walk naturally through follow-up. For this reason, we have consciously followed up these children who showed increased passive muscle tone, 25 cases so far, all of whom had no history of brain injury and mainly showed increased passive muscle tone in the lower extremities. They were followed up until the age of 9 months to more than 1 year, including 24 cases of full-term infants and 1 case of preterm infant (without brain injury). At our suggestion, these 14 babies did not go to professional institutions for rehabilitation training, and were brought up by their parents at home normally, and were followed up by us. The results showed that their motor development was normal according to their developmental pattern, with stable sitting position, flat feet when standing or standing alone, crawling, normal posture when walking or walking alone, and flexible position change. Therefore, doctors should take into account the baby’s medical history and developmental level when examining the baby’s passive muscle tone, and should be cautious when suspecting cerebral palsy. Regarding the question of whether increased passive muscle tone requires rehabilitation, we believe that if the baby’s increased muscle tone affects the baby’s motor development and abnormal posture, etc., rehabilitation is required. Warm tips If the baby only has increased passive muscle tone, no abnormal posture, does not affect its movement, and has no high-risk medical history, it can be followed up first and parents are instructed to strengthen active movement exercises, and the doctor should follow up regularly, and rehabilitation is not needed.