The baby has a high fever but is in good spirits, it may be that the disease is in a progressive stage, or it may indicate that the high fever does not bring other uncomfortable symptoms, the condition itself is not serious, and the baby’s resistance is relatively good. Baby fever, usually caused by pathogenic microbial infections, will affect the respiratory tract, if the virus or viral and other pathogenic infections lead to high fever, not to the central nervous system and other serious infections, the baby’s mental state will show better, at this time, but also timely consultation, to avoid delaying the disease. If usually the baby’s physical quality is relatively good, immunity and resistance is relatively strong, when the pathogen infection, generally will not have too much impact on the baby, therefore, when the baby has a high fever, we should promptly observe the mental state, as well as appetite, temperature and other changes in the seriousness of the baby, we should go to the hospital in a timely manner to check the doctor’s guidance to carry out targeted treatment, to avoid delays in the baby’s condition, the impact of physical health.