A 6-month-old baby with an axillary temperature of more than 37.5 degrees Celsius is considered to have a fever. Normal human body temperature is relatively constant, body temperature exceeds the maximum limit of normal body temperature is fever, which is often referred to as fever. Generally speaking, the axillary body temperature in 36 ~ 37 ℃ is the normal body temperature, by the environment, diet, exercise and time and other factors, body temperature will fluctuate, as long as the body temperature does not exceed 37.5 ℃, are considered normal. Therefore, 6 months baby armpit temperature more than 37.5 ℃ is considered fever. Causes 6 months baby fever more reasons, generally is the existence of inflammation in the body infection, common is the upper respiratory tract infection, the child in addition to fever, there will be a cough, runny nose, nasal congestion and other symptoms. 6 months baby temperature above 37.5 ℃ is fever, for the fever of the child, parents should give the child drink more water, use warm towels to wipe the skin, to achieve the purpose of cooling down, and at the same time timely consultation and treatment.