Fever in a 2-month-old baby is not normal, it may be related to infectious factors, non-infectious factors, etc., and need timely medical treatment. 1. Infectious factors: mostly seen in upper respiratory tract infections, bronchitis, pneumonia, meningitis, enteritis, etc., the pathogens are usually viruses, bacteria, mycoplasma, fungi, etc., which can cause fever, and accompanied by a runny nose, coughing, coughing up phlegm, headache and other symptoms. 2. Non-infectious factors: mostly seen in connective tissue diseases, such as lupus erythematosus, juvenile rheumatoid, etc., often also lead to recurrent fever in infants, and accompanied by joint swelling and pain, dysfunction and other symptoms. Additionally blood system disorders such as leukemia can cause fever in infants, often accompanied by symptoms such as anemia and bleeding. Fever in 2-month-old infants is usually abnormal and has numerous causes. It is recommended to visit the hospital in time to identify the cause and then target treatment.