Calf pain in 6-year-old babies may be caused by over-activity, acute injury, colds and other factors. 1. excessive activity: 6-year-old children’s activities for a long time, may lead to the accumulation of lactic acid metabolites in the muscles of the calf area, will cause calf pain, mainly manifested as soreness, reasonable rest can improve on their own. 2. Acute injury: such as acute strains or external blows, resulting in damage to the calf area, will cause calf pain, may also be accompanied by swelling, subcutaneous bruising and other symptoms. 3. Colds: for example, viral colds, may lead to fever, easy to cause metabolic disorders in the body, local tissue hypoxia, will cause calf as well as thigh area muscle soreness and pain, may also be accompanied by sneezing, runny nose and other symptoms. 6-year-old baby calf pain, there may also be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.