With the recent rapid changes in the weather, many children may catch a “cold” because they do not change their clothing in a timely manner. Colds are usually the most common illness for children. But some children will be infected after waking up with legs “paralyzed” situation, need to attract the attention of parents. 1, who let the baby “paralyzed”? When the weather is changing, it is also the season when children suffer from respiratory infections, which are mostly caused by viral infections. Viral infections can not only involve the respiratory tract, but also muscle tissue. Acute benign myositis in children, also known as infectious myositis, is often a symptom that accompanies upper respiratory tract infections, usually appearing 2-5 days after upper respiratory tract infections. It is caused by viral infections, such as Coxsackie virus, influenza virus, EBV, etc., and in some children it appears after Mycoplasma pneumoniae and Chlamydia pneumoniae infections. The infection often appears suddenly in the morning when the lower limb muscle pain is obvious, mainly gastrocnemius muscle pain, gastrocnemius muscle may appear grip pain, followed by thigh muscle, calf muscle with tenderness. The child often walks with an abnormal gait due to leg pain, and usually the child will refuse to walk. Severe babies will have difficulty walking, manifested as lower limb “paralysis”. 2. What kind of babies does infectious myositis like? Infectious myositis favors children who can run and jump, and occurs mainly in children between the ages of 4 and 12. It is usually more common in boys than in girls, which may be related to the fact that boys are more active and outgoing, have more activities, and come into contact with a wider range of people, making them more susceptible to cross-infection. Therefore, once you have a cold, you must pay attention to rest and avoid strenuous activities. 3. How should babies be treated? Infectious myositis often leads to the child’s own sense of fear, due to the sudden inability to walk on both lower limbs, which will cause psychological harm to the child. And because the disease is a muscle inflammatory reaction caused by viral infection, the serum muscle enzyme spectrum value will increase significantly, even up to 10 times more, which will lead to muscle damage. It needs to be differentiated from acute myelitis, Guillain-Barre syndrome, epidemic myalgia. If the child has significant muscle pain, appropriate restriction of activity and bed rest can help in the recovery of the disease. Antiviral therapy can be given accordingly to the type of virus the child is infected with, supplemented with muscle nutrition and vitamins, adenosine triphosphate, and coenzyme A therapy. For children with severe symptoms and obvious pain, short-term glucocorticosteroid treatment is needed, which can be stopped when symptoms improve. 4. What should parents do? Because of the sudden onset of the disease, parents are very nervous, so it is important to recognize it. Parents are advised to go to the hospital as soon as they find that their children have muscle pain in the limbs, impaired mobility, and are afraid to walk, because the clinical symptoms of many diseases are similar and difficult to differentiate, and if the family members take oral medication at home by themselves, they may delay the child’s condition, and they need to go to the hospital for relevant examinations, such as cardiac enzyme profiles, EMG, and magnetic resonance imaging (MRI) of the head, etc., and have the doctor make the correct diagnosis and treatment based on the results of the examination.