Recurrent fever in 1 year and 3 months old babies may be related to respiratory infections, brain infections, blood disorders and so on. 1. Respiratory infections: such as colds, tonsillitis, pneumonia, etc., usually caused by bacterial or viral infections, babies will have fever, cough and other symptoms. 2. Brain infections: such as encephalitis, tuberculous encephalitis, meningitis and other brain infections, which may be caused by bacterial or viral infections, and will usually be accompanied by recurring fever and other symptoms such as headache and vomiting. 3. Blood diseases: such as leukemia will also have recurrent fever symptoms, may be accompanied by bleeding and other symptoms, need to be clarified through specific tests. There may be other reasons for the recurring fever in a 1 year old 3 month old baby, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then under the guidance of the doctor’s treatment.