Baby 38.3 degrees fever is mostly seen in acute upper respiratory tract infections, toddler rash, pneumonia, etc., need to be targeted to take general treatment, medication. 1. Acute upper respiratory tract infection: early is generally a viral infection, more do not need to use antiviral drugs, mainly let the baby drink more warm water, warm water baths and other physical ways to cool down, if secondary bacterial infections, need to cooperate with the application of antibiotic drugs, such as cefradine particles, cefixime particles. 2. Acute rash: If the fever is caused by acute rash, physical cooling is the main way to reduce the temperature, which can be done locally by using antipyretic patches or lukewarm water baths to reduce the fever. 3. Pneumonia: If it is caused by bacterial infection, amoxicillin, cefradine and other antibiotics can be applied. For mycoplasma infection caused by oral macrolide antibiotic drugs, such as azithromycin, roxithromycin. The baby 38.3 degrees fever, the current main is to take physical cooling, and with the causal treatment but the use of medication must be guided by the doctor, can not be arbitrary to the baby medication. All of the above medications should be used under the guidance of a doctor, avoiding self-medication.